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#1 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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"Drum to Disc" Conversion FAQ 60-70
Drum to Disc conversions 60-70
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by N2TRUX; 02-04-2011 at 09:58 PM. |
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#2 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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"Drum to Disc" conversions 60-62
DRUM TO DISC CONVERSIONS 60-62
60-62 truck with: 63-70 Crossmember Installed 1) The 60-62 trucks have a torsion bar front suspension, which requires swapping the entire 63-70 crossmember and all it's components. 2) A better option would be to swap out a complete 71-72 or 73-87 crossmember to take advantage of the factory disc brakes. Links: *Replace Your Drums With Discs-Article by Brian McCormick *Disc brake upgrade- Article by Early Classic Enterprises ********************************************************* ********************************************************* 60-62 truck with: 71-72 Crossmember Installed 1) Your truck's donor 71-72 crossmember came from the factory with disc brakes. 2) "Year Specific" 71-72 drop spindles are readily available. 3) All spindles and rotors are the HD version (1-1/4" wide). * This will require matching HD calipers. 4) Steering linkage contains 11/16" diameter tie rods. * Inner Tie rods are LH thread. * Outer Tie rods are RH thread. * Inner Tie Rods are a "2-year only" tie rods. (71-72 only) * Outer Tie Rods are a "2-year only" tie rods. (71-72 only) 5) Steering Linkage: * All 71-72 oem linkage will work with 71-72 "year specific" drop spindles. 6) A-arms have steel bushings. 7) 71-72 crossmembers have the steel brake line connect the rubber brake line on the front side of the crossmember. * Steel reproduction brake line sets are specific to the 71-72 design. * There is also a tab welded to the front side of the crossmember, at the location where the steel brake line joins the caliper's rubber brake hose. 8) Rubber brake hoses are a "2-year only" item. (71-72) 9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels on your 60-62 truck. * Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion. * You will need to use a set of steel wheels found on the later 73-87 4x4 trucks. ********************************************************* ********************************************************* 60-62 truck with: 73-87 Crossmember Installed 1) Your trucks 73-87 donor crossmember came from the factory with disc brakes. * Using the 73-87 crossmember allows for upgrading to 73-87 style rubber bushed a-arms. * Most replacement parts are more affordable than the "2-year" specific 71-72 model trucks. * Plus most auto parts stores keep these parts in stock. 2) Drop spindles are readily available,... but there are two versions that must match the two rotor versions below: 3) Rotors: There are two different widths of rotors available on the 73-87 model trucks. 3.1) HD or Heavy Duty rotors: (1-1/4" wide version) available from 73-87 * These will require matching HD bearings and calipers. 3.2) LD or Light Duty rotors: (1" wide version) available from 81-87. * These will require matching LD bearings and calipers. 4) Steering linkage contains 11/16" diameter tie rods. * Inner Tie rods are LH thread. * Outer Tie rods are RH thread. * Inner Tie Rods are 73-87 specific * Outer Tie Rods are 73-87 specific 5) All 73-87 oem steering linkage will work with your 73-87 spindles. 6) The 1/2 ton a-arms have rubber bushed cross shafts * (compared to the steel bushings of the 71-72 a-arms) 7) 73-87 crossmembers have the steel brake line connect the rubber brake hose through a hole originally drilled in the 73-87 frame rail. * Using these crossmembers in the older trucks will require you to fabricate some or all of your steel brake lines. * (63-70 brake lines connect on the rear side of the crossmember) * (71-72 brake lines connect on the front side of the crossmember) * Steel reproduction brake line sets are specific to the 73-87 design with their proportioning valve mounted on a crossmember in front of the engine opposed to hanging below the master cylinder. 8) 73-87 rubber brake hoses are much longer than either the 63-70 drum brake hose or the 71-72 disc brake hose. 9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels. * To use the 6-lug rotors you must have the 73-87 HD spindles,... since all aftermarket 6-lug rotors are only available in the 1-1/4" wide version. * Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion. * You will need to use a set of steel wheels found on the later 73-87 4x4 trucks. ********************************************************* ********************************************************* 60-62 truck with: 71-72 Crossmember Not Yet Installed: 1)The 60-62 trucks have a torsion bar front suspension, which requires swapping the entire 71-72 crossmember and all it's components. 2) 60-62 steering linkage use a different centerlink and tie rods, compared to the 71-72 crossmember you will be installing. 3) 60-62 tie rods are 5/8" diameter,... 71-72 tie rods are 11/16" diameter (with the opposite thread direction). * 60-62 inner tie rods are RH thread vs. 71-72 inner tie rods (that are LH thread). * 63-62 outer tie rods are LH thread vs 71-72 outer tie rods (that are RH thread). * It's easiest to just use all of the 71-72 Steering linkage. * You can also use all of the 73-87 steering linkage, but you will have to change the outer tie rods to the 71-72 version to match the 71-72 spindle. 4) Rubber brake hoses: * You must change to a disc brake style hose. * Early Classic Enterprises, and other suspension vendors, make a "conversion" brake hose that will connect the disc brake caliper, to the original 60-62 brake hose steel line location. * 71-72 hoses is another option. (but I haven't personally confirmed if the steel line connection is the correct size). * Another option is to use 73-87 hoses, (cheaper to purchase), but they are much longer, and also may need fitting adapters. * Aftermarket steel braided hoses and AN fittings is another option. * Most likely there will be a need to fabricate a few, if not all steel brake lines. 5) Some drilling will be required to bolt the 71-72 crossmember in place. ********************************************************* ********************************************************* Links: *1960-62 Front Suspension Upgrade- by markeb01 *1960-62 GMC to SBC V8 motor & trans mounts- by markeb01 *1960 crossmember swap- by markeb01 *89 3/4T 'burb front-end swap to '66 C20- byHilandr451 *Lowering a '75 Shorty With Performance Online and Belltech- by Classic Trucks *Disc Brake Upgrade Reference Thread *CPP Modular Spindle Install ********************************************************* ********************************************************* 60-62 Truck With 6-lug Disc Brakes: 6-Lug Drum to 6-Lug Disc Conversions: 1) This 6-lug disc brake swap will include all of the above 5-lug information. 2) The only difference is the use of an aftermarket 6-lug rotor. * These rotors are new castings. * These rotors have been drilled with the correct 6x5.5" 6-lug pattern. * These rotors have the correct 7/16" lug studs that match the original drum brake lug studs. 3) Several aftermarket suspension vendors sell these rotors,... such as: * ECE (Early Classic Enterprises). * POL (Performance OnLine). * CPP (Classic Performance Products). 4) All 60-62 "conversion" stock height and drop spindles will work with these 6-lug rotors. 5) All 71-72 stock oem and drop spindles will work with these 6-lug rotors. 6) If using a 73-87 spindle,... it must be the HD spindle, that works with the 1-1/4" wide rotors. * The 81-87 LD spindles will not work with these 6-lug rotors. Links: *http://www.earlyclassic.com/tech.asp...arly%20Braking *http://www.earlyclassic.com/tech.asp...h%20And%20Whoa 6-lug Rotors: *http://67-72chevytrucks.com/vboard/s...ght=Disc+Brake ***************************************************************** 60-72 truck with "Unknown" Crossmember Swap? * This is where it's hard to determine the correct parts needed. Here's the break down by year: Disc Brake Spindle: *60-70 (Aftermarket Conversion Spindles) *71-72 (oem or drop) *73-87 (oem or drop) C10 Grouped by Differences: *60-62 *63-70 *71-72 *73-87 (HD 1.25" wide rotors) *81-87 (LD 1.00" wide rotors) **Some 81-87 trucks also had the HD rotors** ** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version** C20 *71-87 Rotors: *71-72 (1.25" wide) *73-87 (HD 1.25" wide rotors) *81-87 (LD 1.00" wide rotors) **Some 81-87 trucks also had the HD rotors** ** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version** Calipers: *71-72 (1.25" wide) *73-87 (HD 1.25" wide rotors) *81-87 (LD 1.00" wide rotors) **Some 81-87 trucks also had the HD rotors** ** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version** Upper Ball Joint: Grouped by Differences: C10 *60-62 *63-70 *71-72 *73-87 C20 *71-87 Lower Ball Joint: Grouped by Differences: C10 *60-62 *63-70 *71-87 C20 *71-87 Control Arm Upper Cross Shafts: Grouped by Differences: C10 *60-62 *63-72 *73-87 C20 *63-87 Control Arm Lower Cross Shafts: Grouped by Differences: C10 *60-62 *63-72 *73-87 C20 *67-86 Inner Tie Rods: Grouped by Differences: C10 *60-62 *63-64 *65-70 *71-72 *73-87 C20 *60-64 (drivers side) *60-64 (pass. side) *65-70 *71-87 Outer Tie Rods: Grouped by Differences: C10 *60-64 *65-70 *71-72 *73-87 C20 *60-64 *65-70 *71-87 Tie Rod Adjusting Sleeves Grouped by Differences: C10 and C20 *60-64 *65-70 (5/8" thread) *71-87 (11/16" thread) Centerlink: Grouped by Differences: *60-62 *63-64 *65-70 *71-72 *73-87 Pitman Arm: Grouped by differences: C10 *60-66 Manual *60-66 P/S *67-72 Manual *67-87 P/S (Specify Year When Ordering) C20 manual: *60-66 *67-68 *69-70 *71-87 Power Steering: *69-70 *71-87 Idler Arm Grouped by differences: C10 *60-62 *63-66 *67-82 *83-87 C20 *60-66 *67-82 *83-87 Steering Box: Manual *60-62 *63-66 *67-82 *83-87 Power Steering
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 01-19-2013 at 10:46 AM. |
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#3 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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"Drum to Disc" conversions 63-66*
DRUM TO DISC CONVERSIONS 63-66
63-66 truck with: 63-66 Crossmember Installed: 1) There are many advantage to leaving your 63-66 crossmember in place to add disc brakes. 2) 63-66 truck owners can now purchase "year specific" standard and drop spindles, from many aftermarket suspension vendors. * No need to change ball joints. * No need to change tie rod ends. * These new "conversion disc brake spindles" are a true "bolt-on" mod to add disc brakes to your truck. 3) The 63-66 a-arms can also be used with any other spindle (71-72 or 73-87) with a simple ball joint change. * The upper and lower ball joints and outer tie rods must match the correct year of spindle you choose. 4) You will need a "conversion" rubber brake hose to connect your disc brake caliper to your existing steel brake line. 5) Keeping your original 63-66 crossmember allows to to leave the engine and transmission in place. * No need to remove drivetrain. * No need to temporarily support the engine, while removeing the crossmember. * Complete disassembly of the front suspension also allows you the ability to clean, inspect, replace or rebuild all the individual components. Links: *http://www.classicperform.com/discdrop.htm *http://www.earlyclassic.com/Tech.asp...20That%20Truck *http://www.customclassictrucks.com/t...all/index.html ********************************************************* ********************************************************* 63-66 truck with: 71-72 Crossmember Installed: 1) Your truck's donor 71-72 crossmember came from the factory with disc brakes. 2) "Year Specific" 71-72 drop spindles are readily available. 3) All 71-72 oem and drop spindles only work with HD rotors. * All 71-72 rotors are the HD version (1-1/4" wide). * The HD rotors will require matching HD calipers. 4) 71-72 steering linkage contains 11/16" diameter tie rods. * Inner Tie rods are LH thread. * Outer Tie rods are RH thread. * Inner Tie Rods are a "2-year only" tie rods. (71-72 only) * Outer Tie Rods are a "2-year only" tie rods. (71-72 only) 5) Steering Linkage: * All 71-72 oem linkage will work with 71-72 "year specific" oem and drop spindles. 6) A-arms have steel bushings. 7) 71-72 crossmembers have the steel brake line connect the rubber brake hose on the front side of the crossmember. * Steel reproduction brake line sets are specific to the 71-72 design. 8) Rubber brake hoses are a "2-year only" item. (71-72) 9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels on your 60-62 truck. * Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion. * You will need to use a set of steel wheels found on the later 73-87 4x4 trucks. ********************************************************* ********************************************************* 63-66 truck with: 71-72 Crossmember Not Yet Installed: 1) Your truck's donor 71-72 crossmember came from the factory with disc brakes. * You can swap out the entire 63-70 crossmember in one unit. * Only a few holes will need to be drilled or elongated. * The best option is to use all of the 71-72 steering components. (centerlink, tie rods, idler arm, steering box and pitman arm) 2) 63-66 steering linkage use a different centerlink and tie rods, than the 71-72 crossmember you will be installing. 3) 63-66 tie rods are 5/8" diameter,... 71-72 tie rods are 11/16" diameter (with the opposite thread direction). * 63-66 inner tie rods are RH thread vs. 71-72 inner tie rods (that are LH thread). * 63-66 outer tie rods are LH thread vs 71-72 outer tie rods (that are RH thread). * Again,... It's easiest to just use all of the 71-72 steering linkage. * You can also use all of the 73-87 steering linkage, but you will have to change the outer tie rods to the 71-72 version to match the 71-72 spindle. 4) If you must use your 63-66 centerlink and inner tie rods: * You will be require to use a "conversion" tie rod sleeve to connect the 63-66 5/8" diameter tie rod,... to the 71-72 11/16" diameter outer tie rod. * Here is the problem: The 63-66 inner tie rod is RH thread. The 71-72 outer tie rod is also RH thread. * To correct this,... you must use a 63-66 outer tie rod in the inner location. * (The 63-66 outer tie rod is LH thread) 5) If you just want to add 71-72 spindles to your existing 63-66 a-arms,... you will need to change the 63-66 upper and lower ball joint to 71-72 upper and lower ball joints. * The outer tie rod will have to be a 71-72 outer tie rod also. (see Step #4 above) 6) Rubber brake hoses: * You must change to a disc brake style hose. * Early Classic Enterprises, and other suspension vendors, make a "conversion" brake hose that will connect the disc brake caliper, to the original 63-66 brake hose steel line location. * 71-72 hoses is another option. (but I haven't personally confirmed if the steel line connection is the correct size). * Another option is to use 73-87 hoses, (cheaper to purchase), but they are much longer, and also may need fitting adapters. * Aftermarket steel braided hoses and AN fittings is another option. 7) You can also just swap all the components from the a-arms out and leave your original 63-66 crossmember in place. * This will require you to completly disassemble both the original 63-66 suspension and the 71-72 donor suspension. * This is also a good time to clean, inspect, replace or rebuild any needed components. Links: *http://67-72chevytrucks.com/vboard/s...+brake+install. * Hotchkis Suspension: http://www.truckinweb.com/tech/suspe...dup/index.html ********************************************************* ********************************************************* 63-66 truck with: 73-87 Crossmember Installed: 1) Your trucks 73-87 donor crossmember came from the factory with disc brakes. * Using the 73-87 crossmember allows for upgrading to 73-87 style rubber bushed a-arms. * Most replacement parts are more affordable than the "2-year" specific 71-72 model trucks. * Plus most auto parts stores keep these parts in stock. 2) Drop spindles are readily available,... but there are two versions that must match the two rotor versions below: 3) Rotors: There are two different widths of rotors available on the 73-87 model trucks. 3.1) HD or Heavy Duty rotors: (1-1/4" wide version) available from 73-87 * These will require matching HD bearings and calipers. 3.2) LD or Light Duty rotors: (1" wide version) available from 81-87. * These will require matching LD bearings and calipers. 4) Steering linkage contains 11/16" diameter tie rods. * Inner Tie rods are LH thread. * Outer Tie rods are RH thread. * Inner Tie Rods are 73-87 specific * Outer Tie Rods are 73-87 specific 5) All 73-87 oem steering linkage will work with your 73-87 spindles. 6) The 1/2 ton a-arms have rubber bushed cross shafts * (compared to the steel bushings of the 71-72 a-arms) 7) 73-87 crossmembers have the steel brake lines, connect the rubber brake hose, through a hole originally drilled in the 73-87 frame rail. * Using these crossmembers in the older trucks will require you to fabricate some or all of your steel brake lines. * (63-66 brake lines connect on the rear side of the crossmember) * (71-72 brake lines connect on the front side of the crossmember) * Steel reproduction brake line sets are specific to the 73-87 design with their proportioning valve mounted on a crossmember in front of the engine opposed to hanging below the master cylinder. 8) 73-87 rubber brake hoses are much longer than either the 63-66 drum brake hose or the 71-72 disc brake hose. 9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels. * To use the 6-lug rotors you must have the 73-87 HD spindles,... since all aftermarket 6-lug rotors are only available in the 1-1/4" wide version. * Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion. * You will need to use a set of steel wheels found on the later 73-87 4x4 trucks. ********************************************************* ********************************************************* 63-66 truck with: 73-87 Crossmember Not Yet Installed: 1) This swap is almost a direct bolt in, with just a few holes to drill/elongate. 2) The preferred method is to use all of the 73-87 steering linkage: * This includes the centerlink, inner and outer tie rods, idler arm and steering box. (A great way to gain P/S) 3) If you must use the 63-66 steering components, you will need to change the tie rods: * The 63-66 inner and outer tie rods are a smaller diameter (5/8") vs. the 73-87 tie rods larger diameter (11/16"). * The 63-66 tie rods are also the opposite thread direction of the 73-87 tie rods. * 63-66 inner is RH thread vs. 73-87 inner which is LH thread. * 63-66 outer is LH thread vs. 73-87 outer which is RH thread. 3.1) So to connect the 73-87 spindle to the 63-66 steering centerlink you must use a: * 63-66 outer tie rod (LH thread) in the inner location. * connect that to a tie rod "conversion sleeve". (these are sold by many aftermarket suspension companies). * use a 73-87 outer (RH thread) to connect to your 73-87 spindle. * Again,... it's much simpler to use all of the 73-87 steering components. 4) Connecting the 73-87 rubber brake lines to the 63-66 steel lines, may require steel line fabrication, or brass "inverted flare" adapters. 5) You can also just swap all the components, from the a-arms out,... and leave your original 63-66 crossmember in place. * This will require you to completly disassemble both the original 63-66 suspension and the 73-87 donor suspension. * This is also a good time to clean, inspect, replace or rebuild any needed components. Links: *http://67-72chevytrucks.com/vboard/s...+brake+install *http://www.67-72chevytrucks.com/vboa...d.php?t=357610 *http://www.classictrucks.com/tech/05...ing/index.html CPP Modular Spindle Install *http://www.classicperform.com/tech_a....05.09-web.pdf *16" WILWOOD Install:http://www.customclassictrucks.com/t...10s/index.html ********************************************************* ********************************************************* 63-66 Truck With 6-lug Disc Brakes: 6-Lug Drum to 6-Lug Disc Conversions: 1) This 6-lug disc brake swap will include all of the above 5-lug information. 2) The only difference is the use of an aftermarket 6-lug rotor. * These rotors are new castings. * These rotors have been drilled with the correct 6x5.5" 6-lug pattern. * These rotors have the correct 7/16" lug studs that match the original drum brake lug studs. 3) Several aftermarket suspension vendors sell these rotors,... such as: * ECE (Early Classic Enterprises). * POL (Performance OnLine). * CPP (Classic Performance Products). 4) All 63-66 "conversion" stock height and drop spindles will work with these 6-lug rotors. 5) All 71-72 stock oem and drop spindles will work with these 6-lug rotors. 6) If using a 73-87 spindle,... it must be the HD spindle, that works with the 1-1/4" wide rotors. * The 81-87 LD spindles will not work with these 6-lug rotors. Links: *http://www.earlyclassic.com/tech.asp...arly%20Braking *http://www.earlyclassic.com/tech.asp...h%20And%20Whoa 6-lug Rotors: *http://67-72chevytrucks.com/vboard/s...ght=Disc+Brake ***************************************************************** 60-72 truck with "Unknown" Crossmember Swap? * This is where it's hard to determine the correct parts needed. Here's the break down by year: Disc Brake Spindle: *60-70 (Aftermarket Conversion Spindles) *71-72 (oem or drop) *73-87 (oem or drop) C10 Grouped by Differences: *60-62 *63-70 *71-72 *73-87 (HD 1.25" wide rotors) *81-87 (LD 1.00" wide rotors) **Some 81-87 trucks also had the HD rotors** ** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version** C20 *71-87 Rotors: *71-72 (1.25" wide) *73-87 (HD 1.25" wide rotors) *81-87 (LD 1.00" wide rotors) **Some 81-87 trucks also had the HD rotors** ** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version** Calipers: *71-72 (1.25" wide) *73-87 (HD 1.25" wide rotors) *81-87 (LD 1.00" wide rotors) **Some 81-87 trucks also had the HD rotors** ** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version** Upper Ball Joint: Grouped by Differences: C10 *60-62 *63-70 *71-72 *73-87 C20 *71-87 Lower Ball Joint: Grouped by Differences: C10 *60-62 *63-70 *71-87 C20 *71-87 Control Arm Upper Cross Shafts: Grouped by Differences: C10 *60-62 *63-72 *73-87 C20 *63-87 Control Arm Lower Cross Shafts: Grouped by Differences: C10 *60-62 *63-72 *73-87 C20 *67-86 Inner Tie Rods: Grouped by Differences: C10 *60-62 *63-64 *65-70 *71-72 *73-87 C20 *60-64 (drivers side) *60-64 (pass. side) *65-70 *71-87 Outer Tie Rods: Grouped by Differences: C10 *60-64 *65-70 *71-72 *73-87 C20 *60-64 *65-70 *71-87 Tie Rod Adjusting Sleeves Grouped by Differences: C10 and C20 *60-64 *65-70 (5/8" thread) *71-87 (11/16" thread) Centerlink: Grouped by Differences: *60-62 *63-64 *65-70 *71-72 *73-87 Pitman Arm: Grouped by differences: C10 *60-66 Manual *60-66 P/S *67-72 Manual *67-87 P/S (Specify Year When Ordering) C20 manual: *60-66 *67-68 *69-70 *71-87 Power Steering: *69-70 *71-87 Idler Arm Grouped by differences: C10 *60-62 *63-66 *67-82 *83-87 C20 *60-66 *67-82 *83-87 Steering Box: Manual *60-62 *63-66 *67-82 *83-87 Power Steering
__________________
Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 01-19-2013 at 10:38 AM. |
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#4 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
|
"Drum to Disc" conversions 67-70
DRUM TO DISC CONVERSIONS 67-70
67-70 truck with 67-70 Crossmember Installed: 1) There are many advantage to leaving your 67-70 crossmember in place to add disc brakes. 2) 67-70 truck owners can now purchase "year specific" standard and drop spindles, from many aftermarket suspension vendors. * No need to change ball joints. * No need to change tie rod ends. * These new "conversion disc brake spindles" are a true "bolt-on" mod to add disc brakes to your truck. 3) The 67-70 a-arms can also be used with any other (71-72 or 73-87) spindle, with a simple ball joint change. * The upper and lower ball joints and outer tie rods must match the correct year of spindle you choose. 4) You will need a "conversion" rubber brake hose to connect your disc brake caliper to your existing steel brake line. * 71-72 rubber brake hoses can be adapted. * Much longer 73-87 brake hoses can also be adapted. * Aftermarket steel braided brake hoses are an option. 5) Keeping your original 67-70 crossmember allows to to leave the engine and transmission in place. * No need to remove drivetrain. * No need to temporarily support the engine, while removing the crossmember. * Complete disassembly of the front suspension also allows you the ability to clean, inspect, replace or rebuild all the individual components. Links: *http://www.classicperform.com/discdrop.htm *http://www.earlyclassic.com/Tech.asp...20That%20Truck *http://www.customclassictrucks.com/t...all/index.html ********************************************************* ********************************************************* 67-70 truck with 71-72 Crossmember Installed: 1) Your truck's donor 71-72 crossmember came from the factory with disc brakes. 2) "Year Specific" 71-72 drop spindles are readily available. 3) All 71-72 oem and drop spindles only work with HD rotors. * All 71-72 rotors are the HD version (1-1/4" wide). * The HD rotors will require matching HD calipers and wheel bearings. 4) 71-72 steering linkage contains 11/16" diameter tie rods. * Inner Tie rods are LH thread. * Outer Tie rods are RH thread. * Inner Tie Rods are a "2-year only" tie rods. (71-72 only) * Outer Tie Rods are a "2-year only" tie rods. (71-72 only) 5) Steering Linkage: * All 71-72 oem linkage will work with 71-72 "year specific" oem and drop spindles. 6) A-arms have steel bushings. 7) 71-72 crossmembers have the steel brake line connect the rubber brake hose on the front side of the crossmember. * Steel reproduction brake line sets are specific to the 71-72 design. 8) Rubber brake hoses are a "2-year only" item. (71-72) 9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels on your 60-62 truck. * Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion. * You will need to use a set of steel wheels found on the later 73-87 4x4 trucks. ********************************************************* ********************************************************* 67-70 truck with 73-87 Crossmember Installed: 1) Your trucks 73-87 donor crossmember came from the factory with disc brakes. * Using the 73-87 crossmember allows for upgrading to 73-87 style rubber bushed a-arms. * Most replacement parts are more affordable than the "2-year" specific 71-72 model trucks. * Most auto parts stores keep these parts "in stock". 2) Drop spindles are readily available,... but there are two versions that must match the two rotor versions below: 3) Rotors: * There are two different widths of rotors available on the 73-87 model trucks. 3.1) HD or Heavy Duty rotors: (1-1/4" wide version) available from 73-87 * These will require matching HD bearings and calipers. 3.2) LD or Light Duty rotors: (1" wide version) available from 81-87. * These will require matching LD bearings and calipers. 4) Steering linkage contains 11/16" diameter tie rods. * Inner Tie rods are LH thread. * Outer Tie rods are RH thread. * Inner Tie Rods are 73-87 specific * Outer Tie Rods are 73-87 specific 5) All 73-87 oem steering linkage will work with your 73-87 spindles. 6) The 1/2 ton a-arms have rubber bushed cross shafts * (compared to the steel bushings of the 71-72 a-arms) 7) 73-87 crossmembers have the steel brake lines, connect the rubber brake hose, through a hole originally drilled in the 73-87 frame rail. * Using these crossmembers in the older trucks will require you to fabricate some or all of your steel brake lines. * (67-70 brake lines connect on the rear side of the crossmember) * (71-72 brake lines connect on the front side of the crossmember) * Steel reproduction brake line sets are specific to the 73-87 design with their proportioning valve mounted on a crossmember in front of the engine opposed to hanging below the master cylinder. 8) 73-87 rubber brake hoses are much longer than either the 63-70 drum brake hose or the 71-72 disc brake hose. 9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels. * To use the 6-lug rotors you must have the 73-87 HD spindles,... since all aftermarket 6-lug rotors are only available in the 1-1/4" wide version. * Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion. * You will need to use a set of steel wheels found on the later 73-87 4x4 trucks. ********************************************************* ********************************************************* 67-70 truck with 71-72 Crossmember Not Yet Installed: 1) Your truck's donor 71-72 crossmember came from the factory with disc brakes. * You can swap out the entire 67-70 crossmember in one unit. * Only a few holes will need to be drilled or elongated. * The best option is to use all of the 71-72 steering components. (centerlink, tie rods, idler arm, steering box and pitman arm) 2) 67-70 steering linkage use a different centerlink and tie rods, than the 71-72 crossmember you will be installing. 3) 67-70 tie rods are 5/8" diameter,... 71-72 tie rods are 11/16" diameter (with the opposite thread direction). * 67-70 inner tie rods are RH thread vs. 71-72 inner tie rods (that are LH thread). * 67-70 outer tie rods are LH thread vs 71-72 outer tie rods (that are RH thread). * Again,... It's easiest to just use all of the 71-72 steering linkage. * You can also use all of the 73-87 steering linkage, but you will have to change the outer tie rods to the 71-72 version to match the 71-72 spindle. 4) If you must use your 67-70 centerlink and inner tie rods: * You will be require to use a "conversion" tie rod sleeve to connect the 67-70 5/8" diameter tie rod,... to the 71-72 11/16" diameter outer tie rod. * Here is the problem: The 67-70 inner tie rod is RH thread. The 71-72 outer tie rod is also RH thread. * To correct this,... you must use a 63-70 outer tie rod in the inner location. * (The 67-70 outer tie rod is LH thread) 5) If you just want to add 71-72 spindles to your existing 67-70 a-arms,... you will need to change the 67-70 upper and lower ball joint to 71-72 upper and lower ball joints. * The outer tie rod will have to be a 71-72 outer tie rod also. (see Step #4 above) 6) Rubber brake hoses: * You must change to a disc brake style hose. * Early Classic Enterprises, and other suspension vendors, make a "conversion" brake hose that will connect the disc brake caliper, to the original 67-70 brake hose steel line location. * 71-72 hoses is another option. (but I haven't personally confirmed if the steel line connection is the correct size). * Another option is to use 73-87 hoses, (cheaper to purchase), but they are much longer, and also may need fitting adapters. * Aftermarket steel braided hoses and AN fittings is another option. 7) You can also just swap all the components from the a-arms out and leave your original 67-70 crossmember in place. * This will require you to completly disassemble both the original 67-70 suspension and the 71-72 donor suspension. * This is also a good time to clean, inspect, replace or rebuild any needed components. Links: *http://67-72chevytrucks.com/vboard/s...+brake+install. * Hotchkis Suspension: http://www.truckinweb.com/tech/suspe...dup/index.html ********************************************************* ********************************************************* 67-70 truck with 73-87 Crossmember Not Yet Installed: 1) Your donor 73-87 crossmember came from the factory with disc brakes. * This swap is almost a direct bolt in, with just a few holes to drill/elongate. 2) The preferred method is to use all of the 73-87 steering linkage: * This includes the centerlink, inner and outer tie rods, idler arm and steering box. (A great way to gain P/S) 3) If you must use the 67-70 steering components, you will need to change the tie rods: * The 67-70 inner and outer tie rods are a smaller diameter (5/8") vs. the 73-87 tie rods larger diameter (11/16"). * The 67-70 tie rods are also the opposite thread direction of the 73-87 tie rods. * 67-70 inner is RH thread vs. 73-87 inner which is LH thread. * 67-70 outer is LH thread vs. 73-87 outer which is RH thread. 3.1) So to connect the 73-87 spindle to the 67-70 steering centerlink you must use a: * 67-70 outer tie rod (LH thread) in the inner location. * connect that to a tie rod "conversion sleeve". (these are sold by many aftermarket suspension companies). * use a 73-87 outer (RH thread) to connect to your 73-87 spindle. * Again,... it's much simpler to use all of the 73-87 steering components. 4) Connecting the 73-87 rubber brake lines to the 67-70 steel lines, may require steel line fabrication, or brass "inverted flare" adapters. 5) You can also just swap all the components, from the a-arms out,... and leave your original 67-70 crossmember in place. * This will require you to completly disassemble both the original 67-70 suspension and the 73-87 donor suspension. * This is also a good time to clean, inspect, replace or rebuild any needed components. Links: *http://67-72chevytrucks.com/vboard/s...+brake+install *http://www.67-72chevytrucks.com/vboa...d.php?t=357610 *http://www.classictrucks.com/tech/05...ing/index.html CPP Modular Spindle Install *http://www.classicperform.com/tech_a....05.09-web.pdf *16" WILWOOD Install:http://www.customclassictrucks.com/t...10s/index.html ********************************************************* ********************************************************* 67-70 Truck With 6-lug Disc Brakes: 6-Lug Drum to 6-Lug Disc Conversions: 1) This 6-lug disc brake swap will include all of the above 5-lug information. 2) The only difference is the use of an aftermarket 6-lug rotor. * These rotors are new castings. * These rotors have been drilled with the correct 6x5.5" 6-lug pattern. * These rotors have the correct 7/16" lug studs that match the original drum brake lug studs. 3) Several aftermarket suspension vendors sell these rotors,... such as: * ECE (Early Classic Enterprises). * POL (Performance OnLine). * CPP (Classic Performance Products). 4) All 63-70 "conversion" stock height and drop spindles will work with these 6-lug rotors. 5) All 71-72 stock oem and drop spindles will work with these 6-lug rotors. 6) If using a 73-87 spindle,... it must be the HD spindle, that works with the 1-1/4" wide rotors. * The 81-87 LD spindles will not work with these 6-lug rotors. Links: *http://www.earlyclassic.com/tech.asp...arly%20Braking *http://www.earlyclassic.com/tech.asp...h%20And%20Whoa * http://www.classictrucks.com/tech/05...all/index.html 6-lug Rotors: *http://67-72chevytrucks.com/vboard/s...ght=Disc+Brake ********************************************************* ********************************************************* ***************************************************************** 60-72 truck with "Unknown" Crossmember Swap? * This is where it's hard to determine the correct parts needed. Here's the break down by year: Disc Brake Spindle: *60-70 (Aftermarket Conversion Spindles) *71-72 (oem or drop) *73-87 (oem or drop) C10 Grouped by Differences: *60-62 *63-70 *71-72 *73-87 (HD 1.25" wide rotors) *81-87 (LD 1.00" wide rotors) **Some 81-87 trucks also had the HD rotors** ** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version** C20 *71-87 Rotors: *71-72 (1.25" wide) *73-87 (HD 1.25" wide rotors) *81-87 (LD 1.00" wide rotors) **Some 81-87 trucks also had the HD rotors** ** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version** Calipers: *71-72 (1.25" wide) *73-87 (HD 1.25" wide rotors) *81-87 (LD 1.00" wide rotors) **Some 81-87 trucks also had the HD rotors** ** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version** Upper Ball Joint: Grouped by Differences: C10 *60-62 *63-70 *71-72 *73-87 C20 *71-87 Lower Ball Joint: Grouped by Differences: C10 *60-62 *63-70 *71-87 C20 *71-87 Control Arm Upper Cross Shafts: Grouped by Differences: C10 *60-62 *63-72 *73-87 C20 *63-87 Control Arm Lower Cross Shafts: Grouped by Differences: C10 *60-62 *63-72 *73-87 C20 *67-86 Inner Tie Rods: Grouped by Differences: C10 *60-62 *63-64 *65-70 *71-72 *73-87 C20 *60-64 (drivers side) *60-64 (pass. side) *65-70 *71-87 Outer Tie Rods: Grouped by Differences: C10 *60-64 *65-70 *71-72 *73-87 C20 *60-64 *65-70 *71-87 Tie Rod Adjusting Sleeves Grouped by Differences: C10 and C20 *60-64 *65-70 (5/8" thread) *71-87 (11/16" thread) Centerlink: Grouped by Differences: *60-62 *63-64 *65-70 *71-72 *73-87 Pitman Arm: Grouped by differences: C10 *60-66 Manual *60-66 P/S *67-72 Manual *67-87 P/S (Specify Year When Ordering) C20 manual: *60-66 *67-68 *69-70 *71-87 Power Steering: *69-70 *71-87 Idler Arm Grouped by differences: C10 *60-62 *63-66 *67-82 *83-87 C20 *60-66 *67-82 *83-87 Steering Box: Manual *60-62 *63-66 *67-82 *83-87 Power Steering
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 01-19-2013 at 10:44 AM. |
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