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#76 |
Registered User
Join Date: Dec 2009
Location: daytona beach fl
Posts: 187
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Re: Disc Brake Upgrade Reference Thread
so is it true that if you swap to disk brakes 6/5 lug that your organal wheels wont work any more?
if this is true why not just go to 5? thanks
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61 step/long bed SBW(SOLD) NEED A NEW PROJECT |
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#77 | |
60-66 Nut
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Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Disc Brake Upgrade Reference Thread
Thonly way you could use those '91 8 lug parts is if it is the Square body style. The Suburbans, and Crewcabs, ans possibly a couple other models were still the Square body thru '91. If it is the '88 and up body style, the only thing you might be able to use would be the rear differential. I'm not sure on the width of the 8 lug rear differentials of those years. I know that the 5 lug differentials are too wide to use in the older trucks. One other thing that you could use from it if it is a newer style truck, is the brake booster, master and prop valve, with one of my booster brackets. That will bolt right up to your '64 GMC.
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I have not done it, but I'm thinking that the C10 shafts and bushings would fit the C20 LCA's. But yeah if it were me I would upgrade to the '73-'87 control arms with the rubber bushings. I would also recommend upgrading to the larger LCA shaft U-bolts used in the '73-'87's.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#78 |
60-66 Nut
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Re: Disc Brake Upgrade Reference Thread
If you have original style 6 lug wheels, they won't work with disc brakes. Some guys have aftermarket or later model 6 lug wheels that are disc brake compatable, so switching to 6 lug discs will allow keeping your wheels. Plus you wouldn't have to change your rear differential, or change the axles in your existing one, if you went with 6 lug discs up front.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#79 |
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Join Date: Dec 2009
Location: daytona beach fl
Posts: 187
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Re: Disc Brake Upgrade Reference Thread
thanks capt
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61 step/long bed SBW(SOLD) NEED A NEW PROJECT |
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#80 |
Senior Member
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Location: Godley, TX
Posts: 17,963
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Re: Disc Brake Upgrade Reference Thread
Wow, what a thread. This is a very helpful one. Have seen several comments that discs will not fit the original 6 lug steelies. A couple questions -
1. Can a spacer be used to make the original 6 lugs work with a disc set-up (i.e. I've not tried it yet - where does the interference actually occur between the caliper and the original 6 lug wheel? is it a wheel diameter thing or backspacing thing, etc) 2. Captain Fab, you mentioned aftermarket and later model 6 lugs would work. Which later model 6 lugs? (all 88-up 1500's?) and what company makes stock-appearing steel wheels that will fit discs? (I've looked at stockton and a few others, but seems their stock looking wheels are not quite stock looking - they are missing the air gaps in between the wheel center and rim, at least on some of the wheels I've seen. Seems later model 6 lugs (88-up) were 16 inch rims? So are you saying that aftermarket steel wheels would also need to be 16 inch to work? I've got 15 inch truck rallies also in addition to the stock steelies, and I'm pretty sure they will work - but I'm going to a bit of effort to just run steelies and poverty caps - looking for the simplest to keep that look yet eventually upgrade to front discs. Thanks a lot folks, great thread. |
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#81 | |
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Join Date: Apr 2001
Location: DALLAS,TX
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Re: Disc Brake Upgrade Reference Thread
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I did a disc swap on my 68 & ran poverty caps on OE 5-lug truck wheels up front w/poverty caps on the OE 6-lug wheels for the rear for several months before swapping the rear axles to 5-lug. If the concern is a spare that fits all 4 corners, Wheel Vintiques, Early Classic, & Stockton each make an OE appearing steelie in various sizes (they don't have to be 16's).
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#82 |
Senior Member
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Location: Godley, TX
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Re: Disc Brake Upgrade Reference Thread
Thanks Scoti, that's good info. Good point about the 5 and 6 / front and back - not a big deal visually (but that spare thing..... I better find a jack too, I keep forgetting to pick one up - then I can worry about tires). Also, thanks for the 15 inch info.
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#83 |
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Join Date: Mar 2003
Location: San Francisco, CA USA
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Re: Disc Brake Upgrade Reference Thread
To add to the wheel discussion, you might want to look at factory wheels from a 71-up K-10. These trucks had disc brakes with 6 lugs, and at least some of them had 15" wheels.
Ray |
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#84 |
Senior Member
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Location: Godley, TX
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Re: Disc Brake Upgrade Reference Thread
would it be the correct bolt circle? that's a great idea, had not thought of that, but they would clear discs. You might be onto something there.. Seems most of them had rallies on them that I have seen, but I think that's because folks PUT them on afterward in many cases - I know I've seen some K10s with steelies.
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#85 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
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Re: Disc Brake Upgrade Reference Thread
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#86 |
Registered User
Join Date: Jun 2009
Location: Lincoln, NE
Posts: 125
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Re: Disc Brake Upgrade Reference Thread
I've looked this over a couple times and maybe still missed it. My 70 2wd has 6 lug disc. On the part swap from 6 to 5, what thickness of 5 lug rotor (1 1/4?) is needed and will this work with the current disc brake caliper?
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#87 |
60-66 Nut
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Re: Disc Brake Upgrade Reference Thread
If your '70 has 6 lug discs up front, they aren't original. They could be either aftermarket rotors for the '71-'87 spindles (I believe those are the 1 1/4" rotors) or they are the '88-'98 light duty 2500 series rotors, spindles and calipers. In light of those possibilities, I would suggest taking a few pics of what you have (particularily the calipers) and post them here, and we can determine which front disc's you have. The parts are not interchangeable between the two options I listed.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#88 |
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Join Date: Jun 2009
Location: Lincoln, NE
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Re: Disc Brake Upgrade Reference Thread
Cool, I figured they had just use a 71+ front end. I'll try to get some pictures up soon, thanks for the help.
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#89 |
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Join Date: Jul 2010
Location: yv, ca
Posts: 280
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Re: Disc Brake Upgrade Reference Thread
got some c20 questions. i have a 70. what is the required to swap to disc up front and would like to run drop spindles. would just rather swap to 1/2 ton specs but i dont want to search for a rear end. thanks in advance
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#90 | |
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Join Date: Apr 2001
Location: DALLAS,TX
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Re: Disc Brake Upgrade Reference Thread
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The rear is going to require swapping..... thus some searching for the replacement. If it's a rear coil truck, 71-72 5-lug housings are a direct swap. 67-70 6-lug housings are 1.5" narrower than 71-72 housings & can have aftermarket 5-lug axles/drums swapped in. 73-87 housings are wider like the 71-72's. These will require more effort for the swap depending again on rear suspension type.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#91 |
C10 CLUB Y QUE!
Join Date: Mar 2010
Location: Here
Posts: 2,770
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Re: Disc Brake Upgrade Reference Thread
Nice thread!
i have a 84 full front clip i rather just use the a arms and drop spindels from it and keep the assit power steering.. is it possible? will the 65 tie rods be a issue hooking up to a new drop spindel |
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#92 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,970
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Re: Disc Brake Upgrade Reference Thread
They won't be a direct bolt-up deal. You'll need 73-87 steering parts or the tie-rod adapters previously mentioned to go from 65 to post-73 spindles.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#93 |
Redneck Hillbilly
Join Date: Jan 2010
Location: Backwoods
Posts: 1,307
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Re: Disc Brake Upgrade Reference Thread
Great thread with a lot of excellent info. Bookmarking for reference for my own upcoming swap.
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#94 | |
C10 CLUB Y QUE!
Join Date: Mar 2010
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Re: Disc Brake Upgrade Reference Thread
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If I use my steering parts will still be able to use the assist or will have to upgrade the steering box |
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#95 |
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Join Date: Apr 2001
Location: DALLAS,TX
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Re: Disc Brake Upgrade Reference Thread
I can't say for sure. I would guess you'll get better results w/the later model power steering.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#96 | |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Disc Brake Upgrade Reference Thread
Quote:
Ray |
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#97 | |
C10 CLUB Y QUE!
Join Date: Mar 2010
Location: Here
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Re: Disc Brake Upgrade Reference Thread
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CAPTAINFAB..... ![]() HEy CAPTAINFAB im going to be sending you some paypal cash tomorrow!!! need the power steering bracket and brake bracket |
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#98 |
Registered User
Join Date: Apr 2009
Location: Amarillo, Texas
Posts: 636
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Re: Disc Brake Upgrade Reference Thread
My son and I put the parts from an ’81 GMC under the 64 on the original cross member. Everything went pretty smooth. One thing to look out for, when drilling the holes out for the 9/16 U bolts, be sure to keep the bit from wandering toward the cross member. We had 2 holes that we had to wrench because we could not get a socket on them. We used the booster and MC from the ’81. We also reused all of the front brake lines. We disconnected the line on the going to the rear underneath the cab. The lines going to the front brakes will use the oval holes in front of the cross member. We used some new ¼” lines going to the back. 1, 51” long and 1, 12” line and 2 couplers. I bought a ¼ to 3/16 adapter but I did not need it. The original rear brake hose had a 3/16 double flare. The hose that I got from O’reilly’s that was supposed to be for the ’64 had a ¼ fitting. The numbers are: Brake Best BH401640. The box also reads that this number replaces DOR BH36502 and RAY 36502.
The truck sits a little higher now in the front. I suppose due to the old springs sagging. We haven’t done the back yet. Also it turns tighter to the left than the right. Do you know if I have something wrong? I may trim the right stop. I couldn't find my pics. I'll take more and post them later.
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Father and son built. Driven daily since 2012. 283, 3 speed. Mostly original. '81 PS and disk front. Fuel tank relocate. Maintenance, repairs and upgrades on his dime now. http://zacks64longfleet.shutterfly.com/ Higher res. photos in my gallery. |
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#99 |
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Location: Wataga,IL
Posts: 666
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Re: Disc Brake Upgrade Reference Thread
so, if this donor 85 truck i have access to has 1" rotors. the front suspension and brakes are useless to me on the 66
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#100 |
60-66 Nut
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Posts: 23,247
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Re: Disc Brake Upgrade Reference Thread
Not completely, unless you don't want to upgrade the upper and lower control arms. The 1" rotor brakes will still be a big improvement over the drums. Of course if you can find a suspension with the 1.250 rotors that would be the way to go. But if you can't find one, you can install this suspension and always upgrade later on.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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