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09-09-2010, 03:17 PM | #1 | |
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Re: Disc Brake Upgrade Reference Thread
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6 lug rotors are available from CPP, Performance Online, and several other vendors. This is an aftermarket part that is a direct swap for the 5 lug. If your 66 has rear coil springs you can get a kit which contains weld-on brackets for the trailing arms and panhard bar. If you want 6 lug shafts for the 76 rear, you can use stock shafts for a 71-87 4WD. Your 66 shafts are too short for the 76 rear. Ray |
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04-05-2011, 07:37 PM | #2 | |
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Re: Disc Brake Upgrade Reference Thread
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HEY!!! I just saw your post and was wondering if you knew where to get the kit you mentioned for the trailing arms? Im working with an extream drop GMC C10 and the pinion angle is going to be way wrong. I knew i was going to have to vut the mounting perches off the rear end and re weld them back to where the pinion angle is at a more useable height, buit if they make the brackets still, i wont have to worry so much about saving the origional ones! Thanks for the input! Heres a photo pf the project for fun |
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09-09-2010, 11:42 PM | #3 | |
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Re: Disc Brake Upgrade Reference Thread
Welcome to the forum and hello neighbor
raycow pretty much covered it. Let me know if you need a power steering box adapter or any of my other parts I make. No shipping since you can just come pick them up. Quote:
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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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09-10-2010, 12:48 AM | #4 |
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Re: Disc Brake Upgrade Reference Thread
LOL.... Thats funny. I was actually checking out your stuff but didnt look that you were in CDA. Ill post up a deal bout my truck. I got too many ideas and dont know what to do. LOL BTW, thanks for the help guys. If that 76 rear end is wider maybe Ill just keep mine, and keep it 6 lug.
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09-11-2010, 12:54 AM | #5 |
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Re: Disc Brake Upgrade Reference Thread
what also a good 5 lug rear end axle that would bolt in with my shaft im not quit sure if it has spring i think it has leaf spring for sure though
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09-14-2010, 05:57 AM | #6 |
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Re: Disc Brake Upgrade Reference Thread
I've got a slightly different question for you guys that have done this swap already. After the swap is done, how is the ride height for a full '73-'87 crossmember and control arms in comparrison to the original '63-'66 front end? Does the truck sit any higher or lower? Mostly I am just curious in a stock for stock contrast. Thanks
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09-14-2010, 05:29 PM | #7 | |
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Re: Disc Brake Upgrade Reference Thread
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If the coil springs are the same, I mean the original ones were for a V8 and the swapped in ones were from a V8 truck (or 6 cyl/6cyl) the heights should be close not counting any amount of settling in the spring...
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11-17-2010, 07:21 PM | #8 | |
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Re: Disc Brake Upgrade Reference Thread
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11-18-2010, 01:25 AM | #9 | |
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Re: Disc Brake Upgrade Reference Thread
Those little 'Y' spacers sound like the shims for the upper control arms. Those are used between the upper control arm shaft and the part of the crossmember against the side of the frame. The shims are added or removed during the front end alignment process to adjust the caster and camber of the front wheels. There's really no way of knowing how many and what thickness to put where without doing a front end alignment. Yes you can bolt the '76 C10 control arms to your '66 GMC front suspension crossmember. As long as it isn't a 3/4 ton. I would recommend upgrading to the larger '76 U-bolts used on the lower control arm shaft. You will need to drill out the holes in the crossmember to do so.
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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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11-18-2010, 01:40 AM | #10 |
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Re: Disc Brake Upgrade Reference Thread
what should i do with the shims i mean can i just put them on how ever for now till its time to get a front end alignment
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11-18-2010, 01:57 AM | #11 |
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Re: Disc Brake Upgrade Reference Thread
I would just keep track of the shims that are on your GMC right now. When you put the '76 control arms on, use the same shims that were on your truck to start with and in the same places. That will get you close enough to get your truck to an alignment shop.
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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 |
11-21-2010, 10:04 PM | #12 |
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Re: Disc Brake Upgrade Reference Thread
Have a '70 C30, am picking up a complete running '81 C30 donor truck. Had planned on doing complete crossmember swap but it has been suggested that I just swap parts onto existing cross member, donor has low milage, late '80's 454 that will be part of the swap, plan to install drop spindles on at same time. I would imagine that most of what has been referenced concerning C10's would relate across the board to the C30. Just wondering if I should remove the complete donor crossmember, rebuild it as needed w/dropped spindles and swap out crossmembers or start w/existing crossmember in '70 and swap parts from '81 ? Thanks in advance.
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11-22-2010, 12:44 AM | #13 |
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Re: Disc Brake Upgrade Reference Thread
I don't remember for sure on a '70 C30 if the lower control arm shafts are round or flat like the '63-'66's. If they are round there is no reason you can't swap everything from the '81 including the control arms. I would suggest going with the lower control arm shaft U-bolts from the '81. I believe they are a little bigger than the '70 pieces.
If the LCA shafts on the '70 are flat, you'll have to either keep the '70 LCA's or swap the entire crossmember
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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 |
11-22-2010, 12:50 AM | #14 |
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Re: Disc Brake Upgrade Reference Thread
Thanks, will check that out.
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'71 C10, Choptop/Lowered '70 C30, w/24' Franklin Motor '91 9c1 Caprice '90 Harley FL, 127 Ultima engine w/6 speed, Blk & chrome |
11-22-2010, 11:50 PM | #15 |
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Re: Disc Brake Upgrade Reference Thread
oops,
I figured it'd be better to just start a new thread: http://67-72chevytrucks.com/vboard/s...92#post4308992
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01-06-2011, 08:24 PM | #16 |
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Re: Disc Brake Upgrade Reference Thread
Hey Guys - hope its cool to post in this FAQ still - Sorry if these questions were answered - I missed if they were.
will 80-87 3/4 ton or 1 ton trucks work for the conversions? What about 73-87 c20's also? As long as theyre 2wd? im assuming they would have the 1-1/4 rotors instead of light duty, right? Im looking to swap to my 64 c10 6 lug - and keep 6 lug - i see the parts store call out for them (thanks) in one of the thread posts a side question - ive got drop coils in my stock arms now - could I resue them? or are the 73-87 coils different for some reason? Can you run drop coils AND spindles? Sean |
01-07-2011, 12:43 AM | #17 | |
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Re: Disc Brake Upgrade Reference Thread
The C20's and C30's prior to '88 are going to have the 8 x 6.5" wheel bolt pattern. Those parts will certainly work if you wanted the 8 x 6.5" bolt pattern.
There are 2 ways to have 6 x 5.5 front disc brakes. one is to use the factory light duty '88-'98 C2500 parts as listed earlier in this thread. Or you can use the typical '71-'87 C10 front suspension parts and then purchase the aftermarket 6 x 5.5" rotors for those spindles. As for the springs, I believe the '73-'87 springs are a little different, but I think the early ones will work. And yes you can run both drop spindles and drop springs at the same time......many guys do to get their desired amont of drop. Quote:
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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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01-13-2011, 12:08 PM | #18 | |
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Re: Disc Brake Upgrade Reference Thread
My dad just did this swap on a 64 c20 w 75 c20 parts. He wanted to keep the 8lug because he had nice wheels on the truck. He had to swap the whole xmember becaused the control arms didn't match up. Also, we found that using the 75 motor mounts pushed the engine about 2 inches forward of where it was originally. Other than that it was the easiest and most problem free part of the build.
Panelrodder Quote:
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01-07-2011, 01:59 AM | #19 |
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Re: Disc Brake Upgrade Reference Thread
thanks cap'n - could I use the c20/c30 a-arms, steering components, sway bar and brake parts with aftermarket drop spindles and rotors (5 or 6)?
theres quite a few 3/4 and 1 tons as parts trucks right now in the area here for cheap id be sourcing drop spindles anyway even if i went with a 73-87 c10 - any diff in a-arms between c10,20,and 30s in the 73-87 yrs? i have 6 lug wheels now, but i also have 5 lug rotors and calipers from another project so Im not sure really if i want to do 5 or 6 |
01-07-2011, 02:25 AM | #20 |
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Re: Disc Brake Upgrade Reference Thread
The C20 and C30 control arms use the steel bushings just like the '63-'72 C10's did. The main issue with using the C20 or C30 control arms, is the lower ball joints are bigger than the C10's. There's really nothing to gain by swapping your '64's control arms for the C20 or C30 arms unless you want to use the '88-'98 LD C2500 parts. This would give you 6 lug front discs
If you're having trouble locating the '73-'87 C10 control arms, I would just keep your original arms. Then just buy your drop spindles, and which ever rotors you decide on. The steering boxes are the same whether from a C10,C20 or C30. However I don't know if the steering linkage will be the same. It is doubtful. The C20 or C30 sway bars will work on your truck. Often times you will find the larger 1- 3/16" bar.
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01-07-2011, 03:01 AM | #21 |
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Re: Disc Brake Upgrade Reference Thread
thats what i was looking for - ill keep looking for 73-87 c10! thanks again as always capt!
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03-15-2011, 11:14 PM | #22 |
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Re: Disc Brake Upgrade Reference Thread
i grabbed the whole front clip from an 85 c10 this weekend for my 64 and will start tearing down, cleaning, painting and stuff like that - couple questions
i plan on getting the DJM 3" drop spindles, can I use the drop coils i got from CPP that Im currently running in my 64 arms? there is a valve on the 85 that mounts ahead of the x-member - is that just a factory proportioning valve or is it the pressure differential switch? It has some electrical connector that I have no clue about - should i just replace with a basic prop valve or what? i dont have anything from my harness to connect to it the shim stack used on the upper arms is unreal - like 8 or 9 per side - any ideas why they would need to do so many? dude says oe spindles and stock coils?? |
03-16-2011, 12:58 AM | #23 | |
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Re: Disc Brake Upgrade Reference Thread
I don't see why you couldn't use your current front coils. Yes that is the factory proportioning valve. The wire on it is just for a low brake warning in case of a faliure in either the front or back system. You don't have to wire that in if you don't want. I would go ahead and use the prop valve unless it is leaking at the end or at the electrical connection.
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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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03-16-2011, 10:00 AM | #24 |
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Re: Disc Brake Upgrade Reference Thread
thanks for the feedback Capn as always!
this front end had an alignment problem it appears - the wheels are still on it - worn heavily to the inside - and the upper control arms have a BIG shim stack - the OP said stock everything, but the front end sat pretty low without a motor in it - so the front coils were cut - any way to verify this? Thats the onyl thing i can think of here to cause the wear |
07-01-2011, 10:14 PM | #25 |
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Re: Disc Brake Upgrade Reference Thread
I am wanting to convert to 8 lug on my 64. what do I need to do? I have a 94 3500 (non dually)parts truck. can I use anything off of it? I plan to use the rear end and all, but I see some references here to front end parts from the newer trucks
thanks |
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