easy disc brake swap - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMC JUNKIE TOO · 01-07-2003, 01:52 PM

awsome, it will be alot cheaper than $899.00 for 6 lug disc brakes evenafter the drop spindles.

JJR · 01-07-2003, 02:40 PM

dream68 can you elaborate on the 88 truck you got the parts off of. Was it a 1/2 ton or 6 lug 3/4 ton? I have Hollanders on my laptop and would be able to post some info for folks. Hollanders does show the 67-70 vs 71-87 3/4 ton lower control arms being different. Which did you use? I have heard you could use the 88-91 3/4 ton 2wd 6-lug rotors on 71-up spindles using 71-up calipers. I went to Autozone and had them pull a 71 1/2 ton 5-lug rotor and a 88 3/4 ton six lug rotor and they were basically the same and appeared to use the same bearing.

dream68 · 01-07-2003, 03:24 PM

JJR: it was a 88 1/2 ton chev 2wd that all these parts came from. everything was ripped off the same truck, even the gearbox, but the gearbox will not fit...

JJR · 01-07-2003, 04:42 PM

Hollanders shows two spindles used on an 88 c1500 2wd. One for a 1" rotor and one for a 1 1/4" rotor. The spindle for the 1" rotor came on 88-91 c1500 and had a 1 1/4" inner bearing surface diameter. The spindle for the 1 1/4" rotor(which is probably what you have) came on the following:
CHEVROLET PICKUP TRUCK 88 2500 Series; 4x2
CHEVROLET PICKUP TRUCK 88-91 1500 Series; 4x2, 1-1/4" thick rotor
CHEVROLET PICKUP TRUCK 89-91 2500 Series; VIN models "C/K", 4x2, 6 bolt wheel
CHEVROLET PICKUP TRUCK 92-98 1500 Series; 4x2
CHEVROLET PICKUP TRUCK 92-98 2500 Series; 4x2, 6 bolt wheel
CHEVROLET PICKUP TRUCK 99 1500 Series; exc. Silverado; 4x2
CHEVROLET VAN 96-99 1500 Series
CHEVROLET VAN 96-99 2500 Series; 7300 lb. GVW
GMC PICKUP TRUCK 88 2500 Series; VIN models "C/K", 4x2
GMC PICKUP TRUCK 88-91 1500 Series; 4x2, 1-1/4" thick rotor
GMC PICKUP TRUCK 89-91 2500 Series; VIN models "C/K", 4x2, 6 bolt wheel
GMC PICKUP TRUCK 92-98 1500 Series; 4x2
GMC PICKUP TRUCK 92-98 2500 Series; 4x2, 6 bolt wheel
GMC PICKUP TRUCK 99 1500 Series; old style (flat, pull-up outside door handle), 4x2
GMC VAN 96-99 1500 Series
GMC VAN 96-99 2500 Series; 7300 lb. GVW
SUBURBAN 92 1500 Series; 4x2
SUBURBAN 93-96 1500 Series; 4x2, vacuum brake booster
SUBURBAN 97-99 1500 Series; 4x2, gas
TAHOE/YUKON 95-99 4x2

'95 up have ABS sensors on the brake shield.
1-3/8" inner bearing surface dia.
Inner bearing consists of #LM48548 cone & #LM48510 cup.
Heavy duty chassis option code is F44..

15981299 R.
15981298 L.

For lower control arm: the 67-70 3/4 lower arm can come from the following:
CHEVROLET FORWARD CONTROL 68-70 20 Series
CHEVROLET FORWARD CONTROL 68-70 30 Series; 7200 lb. rear axle
CHEVROLET PICKUP TRUCK 67-70 20 Series
CHEVROLET PICKUP TRUCK 67-70 30 Series; 7200 lb. rear axle
CHEVROLET VAN 71 30 Series; drum brake
GMC FORWARD CONTROL 68-70 2500 Series
GMC FORWARD CONTROL 68-70 3500 Series; 7200 lb. rear axle
GMC PICKUP TRUCK 67-70 2500 Series
GMC PICKUP TRUCK 67-70 3500 Series; 7200 lb. rear axle
GMC VAN 71 3500 Series; drum brake
SUBURBAN 67-70 20 Series
SUBURBAN 67-70 2500 Series

If the 71-up 3/4 ton lower control arm can work they can come from the following:
CHEVROLET FORWARD CONTROL 71-72 30 Series; 7200 lb. rear axle
CHEVROLET FORWARD CONTROL 71-89 20 Series
CHEVROLET FORWARD CONTROL 73-78 30 Series; non-removable carrier
CHEVROLET FORWARD CONTROL 79-84 30 Series; drum rear brakes, sgl. rear wheels
CHEVROLET FORWARD CONTROL 85-92 30 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels
CHEVROLET FORWARD CONTROL 93 30 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels, w/o 9L6 brakes
CHEVROLET PICKUP TRUCK 71-72 30 Series; 7200 lb. rear axle
CHEVROLET PICKUP TRUCK 71-88 20 Series
CHEVROLET PICKUP TRUCK 73-80 30 Series
CHEVROLET PICKUP TRUCK 81-88 30 Series; std. duty susp.
CHEVROLET PICKUP TRUCK 89-91 2500 Series; VIN models "R/V"
CHEVROLET PICKUP TRUCK 89-91 3500 Series; VIN models "R/V", std. duty susp.
CHEVROLET VAN 72-78 30 Series
GMC FORWARD CONTROL 71-72 3500 Series; 7200 lb. rear axle
GMC FORWARD CONTROL 71-89 2500 Series
GMC FORWARD CONTROL 73-78 3500 Series; non-removable carrier
GMC FORWARD CONTROL 79-84 3500 Series; drum rear brakes, sgl. rear wheels
GMC FORWARD CONTROL 85-92 3500 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels
GMC FORWARD CONTROL 93 3500 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels, w/o 9L6 brakes
GMC PICKUP TRUCK 71-72 3500 Series; 7200 lb. rear axle
GMC PICKUP TRUCK 71-87 2500 Series
GMC PICKUP TRUCK 73-80 3500 Series
GMC PICKUP TRUCK 81-87 3500 Series; std. duty susp.
GMC PICKUP TRUCK 88-91 3500 Series; VIN models "R/V", std. duty susp.
GMC VAN 72-78 3500 Series
SUBURBAN 71-88 20 Series
SUBURBAN 71-91 2500 Series

This statement makes for some confusion: This arm (71-up) may have two different ball joints one being light duty, the other being heavy duty. I am assumming they would be different diameters.

I hope this info helps.

ChopTop · 01-08-2003, 01:15 AM

WHOA!

crazy longhorn · 01-08-2003, 01:48 AM

JJR,the info given to me on the 3/4 tons(from local napa) is the ball joints interchange from 71-86 or 87 on the pickups. I didnt see his book, so it was just info given to me. I do know from experience that the 71 3/4 ton lower ball joint will press into the 67-70 3/4 ton lower arms, but the steer stops are different on the older arms(same deal as the 1/2 tons, it will shorten the turning radius), & will require a little grinding on the stops on the spindles to straighten it up.......crazyL

JJR · 01-08-2003, 08:23 AM

That is good to know Crazy Longhorn. The local pull-a-part tends to have a good selection of 3/4 ton trucks and occationally an 88-up. The get $15 for control arms and spindles. I have also seen several sets of 88-up spindles on e-bay go dirt cheap. People put drop spindles on and basically give away the old ones. Since a already have a set of 71 1/2 ton control arms and spindles and new ball joints for them, I will probably end up buying a set of 6-lug rotors and use what I have.

70c10 · 01-08-2003, 08:45 AM

Cool!, This sounds like the next topic on the FAQ board, hopefully with a few pics!. Thanks guys.

sixnine · 01-08-2003, 01:04 PM

Man, this is the reason I just love this site! This changeover will definetly be on my list of improvements I plan to make over the next 2 years. I'll be enrolling in the Auto-Body program at the local Community College and the instructor said I could use the school shop and tools after hours. Do any of you see any interference issues if I were to use an '88-'95 dropped spindle with this swap? Dream 68.............keep us informed and post any pictures. Great job!

dream68 · 01-08-2003, 04:22 PM

OK GUYS: the steering linkage is a tad sloppy in the spindle, so this is what you do. use the 68 intermediate shaft with the 88 tie rods. the inside tie rod end is changed to PART# : MOOG ES2020RL.(tie rod end). This setup fits and looks like a dream with no binding anywhere. the 88 tie rods are also bulkier than the 68 original setup..... I will be in touch with more updates as i go... KEEP ON TRUCKIN MAMA!!!!

dream68 · 01-08-2003, 05:04 PM

ALL PARTS NEEDED FOR BRAKE CONVERSION ON 68:::1968 1/2 ton top a-arm, 1970 3/4 ton bottom a-arm, 1988 1/2 ton ball joints(both), 1988 1/2 ton spindles, calipers, and rotors, 1968 1/2 ton intermediate shaft, 1988 1/2 ton tie rods, with the inner tie rod end changed to part#: MOOG ES2020. Brake lines can be changed if need be!!! GET TO WORK!!!

wnc mountain · 01-08-2003, 05:25 PM

This is great info...but...anyone know if this will work for a 70

dream68 · 01-08-2003, 05:49 PM

wnc mountain: i believe it should work because the boneyard told me the a-arms were the same from 68-70.

wnc mountain · 01-08-2003, 08:42 PM

Thanks, I will have to give that a look. This may actually sway me to go with disks.

01-07-2003, 02:40 PM	#27
JJR Registered User Join Date: Apr 2000 Location: Leesburg, GA Posts: 746	dream68 can you elaborate on the 88 truck you got the parts off of. Was it a 1/2 ton or 6 lug 3/4 ton? I have Hollanders on my laptop and would be able to post some info for folks. Hollanders does show the 67-70 vs 71-87 3/4 ton lower control arms being different. Which did you use? I have heard you could use the 88-91 3/4 ton 2wd 6-lug rotors on 71-up spindles using 71-up calipers. I went to Autozone and had them pull a 71 1/2 ton 5-lug rotor and a 88 3/4 ton six lug rotor and they were basically the same and appeared to use the same bearing. __________________ FOUNDING MEMBER OF THE DRUM BRAKE CLUB Second Owner 70 C-10 Second Owner 93 GMC C1500 Third Owner 99 C2500 Crew Cab Short Bed

01-07-2003, 03:24 PM	#28
dream68 Registered User Join Date: Dec 2002 Location: kelowna b.c. canada Posts: 75	JJR: it was a 88 1/2 ton chev 2wd that all these parts came from. everything was ripped off the same truck, even the gearbox, but the gearbox will not fit... __________________ '68 Chev C-10 '91 Western Star (workin wheels) Just an ole time truckin idiot! Jim G.

01-07-2003, 04:42 PM	#29
JJR Registered User Join Date: Apr 2000 Location: Leesburg, GA Posts: 746	Hollanders shows two spindles used on an 88 c1500 2wd. One for a 1" rotor and one for a 1 1/4" rotor. The spindle for the 1" rotor came on 88-91 c1500 and had a 1 1/4" inner bearing surface diameter. The spindle for the 1 1/4" rotor(which is probably what you have) came on the following: CHEVROLET PICKUP TRUCK 88 2500 Series; 4x2 CHEVROLET PICKUP TRUCK 88-91 1500 Series; 4x2, 1-1/4" thick rotor CHEVROLET PICKUP TRUCK 89-91 2500 Series; VIN models "C/K", 4x2, 6 bolt wheel CHEVROLET PICKUP TRUCK 92-98 1500 Series; 4x2 CHEVROLET PICKUP TRUCK 92-98 2500 Series; 4x2, 6 bolt wheel CHEVROLET PICKUP TRUCK 99 1500 Series; exc. Silverado; 4x2 CHEVROLET VAN 96-99 1500 Series CHEVROLET VAN 96-99 2500 Series; 7300 lb. GVW GMC PICKUP TRUCK 88 2500 Series; VIN models "C/K", 4x2 GMC PICKUP TRUCK 88-91 1500 Series; 4x2, 1-1/4" thick rotor GMC PICKUP TRUCK 89-91 2500 Series; VIN models "C/K", 4x2, 6 bolt wheel GMC PICKUP TRUCK 92-98 1500 Series; 4x2 GMC PICKUP TRUCK 92-98 2500 Series; 4x2, 6 bolt wheel GMC PICKUP TRUCK 99 1500 Series; old style (flat, pull-up outside door handle), 4x2 GMC VAN 96-99 1500 Series GMC VAN 96-99 2500 Series; 7300 lb. GVW SUBURBAN 92 1500 Series; 4x2 SUBURBAN 93-96 1500 Series; 4x2, vacuum brake booster SUBURBAN 97-99 1500 Series; 4x2, gas TAHOE/YUKON 95-99 4x2 '95 up have ABS sensors on the brake shield. 1-3/8" inner bearing surface dia. Inner bearing consists of #LM48548 cone & #LM48510 cup. Heavy duty chassis option code is F44.. 15981299 R. 15981298 L. For lower control arm: the 67-70 3/4 lower arm can come from the following: CHEVROLET FORWARD CONTROL 68-70 20 Series CHEVROLET FORWARD CONTROL 68-70 30 Series; 7200 lb. rear axle CHEVROLET PICKUP TRUCK 67-70 20 Series CHEVROLET PICKUP TRUCK 67-70 30 Series; 7200 lb. rear axle CHEVROLET VAN 71 30 Series; drum brake GMC FORWARD CONTROL 68-70 2500 Series GMC FORWARD CONTROL 68-70 3500 Series; 7200 lb. rear axle GMC PICKUP TRUCK 67-70 2500 Series GMC PICKUP TRUCK 67-70 3500 Series; 7200 lb. rear axle GMC VAN 71 3500 Series; drum brake SUBURBAN 67-70 20 Series SUBURBAN 67-70 2500 Series If the 71-up 3/4 ton lower control arm can work they can come from the following: CHEVROLET FORWARD CONTROL 71-72 30 Series; 7200 lb. rear axle CHEVROLET FORWARD CONTROL 71-89 20 Series CHEVROLET FORWARD CONTROL 73-78 30 Series; non-removable carrier CHEVROLET FORWARD CONTROL 79-84 30 Series; drum rear brakes, sgl. rear wheels CHEVROLET FORWARD CONTROL 85-92 30 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels CHEVROLET FORWARD CONTROL 93 30 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels, w/o 9L6 brakes CHEVROLET PICKUP TRUCK 71-72 30 Series; 7200 lb. rear axle CHEVROLET PICKUP TRUCK 71-88 20 Series CHEVROLET PICKUP TRUCK 73-80 30 Series CHEVROLET PICKUP TRUCK 81-88 30 Series; std. duty susp. CHEVROLET PICKUP TRUCK 89-91 2500 Series; VIN models "R/V" CHEVROLET PICKUP TRUCK 89-91 3500 Series; VIN models "R/V", std. duty susp. CHEVROLET VAN 72-78 30 Series GMC FORWARD CONTROL 71-72 3500 Series; 7200 lb. rear axle GMC FORWARD CONTROL 71-89 2500 Series GMC FORWARD CONTROL 73-78 3500 Series; non-removable carrier GMC FORWARD CONTROL 79-84 3500 Series; drum rear brakes, sgl. rear wheels GMC FORWARD CONTROL 85-92 3500 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels GMC FORWARD CONTROL 93 3500 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels, w/o 9L6 brakes GMC PICKUP TRUCK 71-72 3500 Series; 7200 lb. rear axle GMC PICKUP TRUCK 71-87 2500 Series GMC PICKUP TRUCK 73-80 3500 Series GMC PICKUP TRUCK 81-87 3500 Series; std. duty susp. GMC PICKUP TRUCK 88-91 3500 Series; VIN models "R/V", std. duty susp. GMC VAN 72-78 3500 Series SUBURBAN 71-88 20 Series SUBURBAN 71-91 2500 Series This statement makes for some confusion: This arm (71-up) may have two different ball joints one being light duty, the other being heavy duty. I am assumming they would be different diameters. I hope this info helps. __________________ FOUNDING MEMBER OF THE DRUM BRAKE CLUB Second Owner 70 C-10 Second Owner 93 GMC C1500 Third Owner 99 C2500 Crew Cab Short Bed

01-08-2003, 01:15 AM	#30
ChopTop Registered User Join Date: Jun 2001 Location: KINGWOOD TEXAS Posts: 515	COWABUNGA!!! WHOA! __________________ Member of the "Old Farts Club"

01-08-2003, 01:48 AM	#31
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	JJR,the info given to me on the 3/4 tons(from local napa) is the ball joints interchange from 71-86 or 87 on the pickups. I didnt see his book, so it was just info given to me. I do know from experience that the 71 3/4 ton lower ball joint will press into the 67-70 3/4 ton lower arms, but the steer stops are different on the older arms(same deal as the 1/2 tons, it will shorten the turning radius), & will require a little grinding on the stops on the spindles to straighten it up.......crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

01-07-2003, 01:52 PM	#26
GMC JUNKIE TOO THE QUICKER FIXERUPER Join Date: Jul 2002 Location: Ok Posts: 615	awsome, it will be alot cheaper than $899.00 for 6 lug disc brakes evenafter the drop spindles.

01-08-2003, 08:23 AM	#32
JJR Registered User Join Date: Apr 2000 Location: Leesburg, GA Posts: 746	That is good to know Crazy Longhorn. The local pull-a-part tends to have a good selection of 3/4 ton trucks and occationally an 88-up. The get $15 for control arms and spindles. I have also seen several sets of 88-up spindles on e-bay go dirt cheap. People put drop spindles on and basically give away the old ones. Since a already have a set of 71 1/2 ton control arms and spindles and new ball joints for them, I will probably end up buying a set of 6-lug rotors and use what I have. __________________ FOUNDING MEMBER OF THE DRUM BRAKE CLUB Second Owner 70 C-10 Second Owner 93 GMC C1500 Third Owner 99 C2500 Crew Cab Short Bed

01-08-2003, 08:45 AM	#33
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Cool!, This sounds like the next topic on the FAQ board, hopefully with a few pics!. Thanks guys. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

01-08-2003, 01:04 PM	#34
sixnine Longtime Member Join Date: Oct 2002 Location: Over Yonder (DFW) Posts: 171	Man, this is the reason I just love this site! This changeover will definetly be on my list of improvements I plan to make over the next 2 years. I'll be enrolling in the Auto-Body program at the local Community College and the instructor said I could use the school shop and tools after hours. Do any of you see any interference issues if I were to use an '88-'95 dropped spindle with this swap? Dream 68.............keep us informed and post any pictures. Great job! __________________ Rokcrln - *"I'm a major car addict so trying to go as low buck as possible is like asking a coke head to use flower to save money."* 1972 C10 Short Step -http://67-72chevytrucks.com/vboard/s...d.php?t=261405

01-08-2003, 04:22 PM	#35
dream68 Registered User Join Date: Dec 2002 Location: kelowna b.c. canada Posts: 75	OK GUYS: the steering linkage is a tad sloppy in the spindle, so this is what you do. use the 68 intermediate shaft with the 88 tie rods. the inside tie rod end is changed to PART# : MOOG ES2020RL.(tie rod end). This setup fits and looks like a dream with no binding anywhere. the 88 tie rods are also bulkier than the 68 original setup..... I will be in touch with more updates as i go... KEEP ON TRUCKIN MAMA!!!! __________________ '68 Chev C-10 '91 Western Star (workin wheels) Just an ole time truckin idiot! Jim G.

01-08-2003, 05:04 PM	#36
dream68 Registered User Join Date: Dec 2002 Location: kelowna b.c. canada Posts: 75	ALL PARTS NEEDED FOR BRAKE CONVERSION ON 68:::1968 1/2 ton top a-arm, 1970 3/4 ton bottom a-arm, 1988 1/2 ton ball joints(both), 1988 1/2 ton spindles, calipers, and rotors, 1968 1/2 ton intermediate shaft, 1988 1/2 ton tie rods, with the inner tie rod end changed to part#: MOOG ES2020. Brake lines can be changed if need be!!! GET TO WORK!!! __________________ '68 Chev C-10 '91 Western Star (workin wheels) Just an ole time truckin idiot! Jim G.

01-08-2003, 05:25 PM	#37
wnc mountain More hobbies than money! Join Date: Jan 2002 Location: Raleigh, nc, usa Posts: 655	This is great info...but...anyone know if this will work for a 70 __________________ '70 cst10/swb 350, 3 on the tree, factory buckets. '70 GMC lwb 350/350 ps,pb '72 c-10 lwb 350/350 a/c, ps, pb '72 Blazer project

01-08-2003, 05:49 PM	#38
dream68 Registered User Join Date: Dec 2002 Location: kelowna b.c. canada Posts: 75	wnc mountain: i believe it should work because the boneyard told me the a-arms were the same from 68-70. __________________ '68 Chev C-10 '91 Western Star (workin wheels) Just an ole time truckin idiot! Jim G.

01-08-2003, 08:42 PM	#39
wnc mountain More hobbies than money! Join Date: Jan 2002 Location: Raleigh, nc, usa Posts: 655	Thanks, I will have to give that a look. This may actually sway me to go with disks. __________________ '70 cst10/swb 350, 3 on the tree, factory buckets. '70 GMC lwb 350/350 ps,pb '72 c-10 lwb 350/350 a/c, ps, pb '72 Blazer project



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