Rear end disc - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andy4639 · 10-26-2014, 10:20 AM

Does anyone have a good step by step for doing a rear end disc swap on a GM 12 bolt truck rear end? I bought the kit from CPP and want to try and get installed next week if possible. It says they have the best instruction with the kit but would like to read over some to see what I need for this.

502ms · 10-26-2014, 11:12 AM

Is that a bolt-on kit or welding required?
Come on down to GA, we get you squared away - then you can meet DD

Andy4639 · 10-26-2014, 08:27 PM

Quote:

Originally Posted by 502ms

Is that a bolt-on kit or welding required?
Come on down to GA, we get you squared away - then you can meet DD

It's the bolt in. No welding that I know of man! I would love to come to Ga but starting 12 - 6 tomorrow night.
I'm hoping the kit is here tomorrow.

Custom 68 · 10-27-2014, 09:10 AM

did you download theirs off the website?

Andy4639 · 10-27-2014, 01:34 PM

Quote:

Originally Posted by Custom 68

did you download theirs off the website?

Dave I did, would like a little better understanding of how to get the c clips out of the gear. I think I can do it but a little more info would be nice.
Here is the kit. I upgraded to slotted and drilled rotors + the S/S brake lines instead of rubber ones..

**RRR18** · 10-27-2014, 01:53 PM

Getting the rear axle c clips out so you can slide out the axles I assume??
If so it's pretty easy.
Remove rear diff cover
Find and remove small bolt holding in center carrier pin
Slide out carrier pin
Push axles into center of diff allowing c clips to become "free"
Use a long magnet and/or pic to pull clips off axles
Slide out axles

**PGSigns** · 10-27-2014, 02:23 PM

Good looking kit. Did you get the right master cylinder and proportioning valve from them also? Do they have a kit for that?
Jimy

Custom 68 · 10-27-2014, 03:28 PM

That is going to be nice Andy. Like Ryan said above the c clips come out real easy.
I think when you get in there you will see what he means. The only real tool needed is to remove that small bolt. Also the gears and center section all stay put. I think I read somewhere you might change gears, that is a whole different project none of that will come loose just the axles slide out.
I know you just replaced some of your brake master cylinder and booster stuff but I believe you will need a different prop valve and probably a dual disk master like Jimmy was asking.

Andy4639 · 10-27-2014, 04:31 PM

RRR18,
Thanks for the info man that is what I was wanting to know. I should be able to do this in the garage with no problems. I'm not 100% on the gear swap yet Dave. I want to do new bearings and seals though for sure.

Yes when I upgraded I got a new prop valve as well. The kit was $689.00 after all the upgrades.

Andy4639 · 10-27-2014, 07:14 PM

Heading to work tonight my neighbor was outside so we started talking. He has offered his lift to me to do the brake swap. I will be taking my truck over there Friday and starting on taking it a part. He said as long as I was done by the following weekend I could leave it and work a little each day on it. I like that and it's a brand new shop he has built.

Andy4639 · 10-29-2014, 11:09 PM

The kit showed up today so I set to start Friday. Will post pictures as I go I hope. Going to try and have my daughter with me to do the pictures as I do the work. The kit looks nice. Going to put the first coat of red on the calipers tomorrow!

Andy4639 · 10-31-2014, 07:36 PM

Well I spent 10 hrs on the rear end today and I still have no brakes.

CPP's kit leaves a lot to be desired. No instructions as far as details, they have a sequence but no details. The spacers they have in the kit may are may not have to be used. Drivers side looks tight to me but they are on with spacers passenger side wouldn't go on at all so I called CPP and the answer was if they don't work don't use them! Nothing is mentioned in the instructions about not using them. I took them back off and it fit right up. The rotors are tight but I can spin them by hand and that's all they say. I'm hoping after driving it a little they will loosen up some after the pads are worn in. I may take the drivers side off again and use some shims instead of the spacer.
Looking on the drivers side the caliper is up against the bracket, on the passenger side it has a 1/4" gap.

The rear hard lines are for a Chevelle are Camaro they wouldn't fit my tee connection. Had to go get the fittings to adapt over to the bigger fitting. Called about that too! They said they sent the most popular size which is for a car not a truck. If you order this kit make sure you tell them you want the bigger fittings.

Andy4639 · 11-01-2014, 05:18 PM

I have rear disc brakes on the truck. They still need some more bleeding I think though. I drove it home and had to tighten up on the pop valve some it was leaking. I guess I need to bleed them all again. The CPP kit would not be my choice again if I ever do another one that's for sure. The clips that hold the brake lines on the axle didn't even fit the hose fittings

Kook87 · 11-01-2014, 09:53 PM

wilwood kits seem to be nice and complete and also I believe are the only ones with the integrated parking brake.

Andy4639 · 11-02-2014, 10:40 AM

Quote:

Originally Posted by Kook87

wilwood kits seem to be nice and complete and also I believe are the only ones with the integrated parking brake.

These kits have the parking brake also just that they are a real pain to adjust. I'm going to try and adjust them some more today if I get time.

siroadrnr · 11-03-2014, 03:07 PM

Andy, they look great on there. I hope they perform as well as they look. Most "kits" need tweaking, as you found out, but we always learn something in the process. Thanks for sharing!!

Andy4639 · 11-03-2014, 08:22 PM

The kit over all is OK not great but OK. The details are what I hate. I need to do some more bleeding I think. Driving it to work tonight the brake light on the dash would come on so I think I need to bleed the system some more and the pedal isn't that good either. I need to adjust the parking brake cable some more to.

**Hart_Rod** · 11-04-2014, 09:24 AM

Andy - you may want to read these articles on adjusting the parking brake:

http://www.classicperform.com/TechBo...oubleshoot.htm

http://www.classicperform.com/TechBo...ot.htm#parking

http://www.camaros.net/forums/showthread.php?t=73407

Andy4639 · 11-04-2014, 07:00 PM

Quote:

Originally Posted by Hart_Rod

Andy - you may want to read these articles on adjusting the parking brake:

http://www.classicperform.com/TechBo...oubleshoot.htm

http://www.classicperform.com/TechBo...ot.htm#parking

http://www.camaros.net/forums/showthread.php?t=73407

Thanks, yea I got the parking brake cable down I had my daughter pumping the brakes for me when I did them and I think she was a little scared of them. I loosened up the park cable a little to much so that has got to be tightened back up some and should be good.
The brakes need to be bleed again as well as she never once said the pedal went to the floor while bleeding them. The tires wouldn't spin though while I was bleeding so I figure I have more to do.

Custom 68 · 11-12-2014, 10:09 AM

Andy, did you get the bugs all worked out of this? How is it stopping now?

Andy4639 · 11-13-2014, 02:52 PM

Hey Dave,
yea I think I finally got them all bleed out and adjusted. I ended up having to take the drivers side back off and adjusting the e brake again but I think I have it. I drove it last night to work and it seems to stop pretty good. I can't tell a big difference in normal stopping but if I really mash the pedal it will stop darn quick.

10-26-2014, 10:20 AM	#1
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Rear end disc Does anyone have a good step by step for doing a rear end disc swap on a GM 12 bolt truck rear end? I bought the kit from CPP and want to try and get installed next week if possible. It says they have the best instruction with the kit but would like to read over some to see what I need for this. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-26-2014, 11:12 AM	#2
502ms Registered User Join Date: Aug 2011 Location: Atlanta, GA Posts: 1,523	Re: Rear end disc Is that a bolt-on kit or welding required? Come on down to GA, we get you squared away - then you can meet DD __________________ Best Regards, Leon M. Instagram: @TheDirtyDianah Bagged \| 6.0L LS \| T-56 (6-Speed Manual) \| Turbo Burnout/Rolling Video: Chevy C10 Stepside 6.0L LSx & 6-Speed Manual

10-27-2014, 09:10 AM	#4
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Rear end disc did you download theirs off the website? __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

10-27-2014, 01:53 PM	#6
RRR18 Senior Member Join Date: Nov 2010 Location: Lordstown, OH / Wentzville, MO Posts: 870	Re: Rear end disc Getting the rear axle c clips out so you can slide out the axles I assume?? If so it's pretty easy. Remove rear diff cover Find and remove small bolt holding in center carrier pin Slide out carrier pin Push axles into center of diff allowing c clips to become "free" Use a long magnet and/or pic to pull clips off axles Slide out axles __________________ '67 BAD IDEA Follow on Instagram https://www.instagram.com/rtimes3c10/ Ryan

10-27-2014, 02:23 PM	#7
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: Rear end disc Good looking kit. Did you get the right master cylinder and proportioning valve from them also? Do they have a kit for that? Jimy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

10-27-2014, 03:28 PM	#8
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Rear end disc That is going to be nice Andy. Like Ryan said above the c clips come out real easy. I think when you get in there you will see what he means. The only real tool needed is to remove that small bolt. Also the gears and center section all stay put. I think I read somewhere you might change gears, that is a whole different project none of that will come loose just the axles slide out. I know you just replaced some of your brake master cylinder and booster stuff but I believe you will need a different prop valve and probably a dual disk master like Jimmy was asking. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

10-27-2014, 04:31 PM	#9
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Rear end disc RRR18, Thanks for the info man that is what I was wanting to know. I should be able to do this in the garage with no problems. I'm not 100% on the gear swap yet Dave. I want to do new bearings and seals though for sure. Yes when I upgraded I got a new prop valve as well. The kit was $689.00 after all the upgrades. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-27-2014, 07:14 PM	#10
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Rear end disc Heading to work tonight my neighbor was outside so we started talking. He has offered his lift to me to do the brake swap. I will be taking my truck over there Friday and starting on taking it a part. He said as long as I was done by the following weekend I could leave it and work a little each day on it. I like that and it's a brand new shop he has built. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-29-2014, 11:09 PM	#11
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Rear end disc The kit showed up today so I set to start Friday. Will post pictures as I go I hope. Going to try and have my daughter with me to do the pictures as I do the work. The kit looks nice. Going to put the first coat of red on the calipers tomorrow! __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-31-2014, 07:36 PM	#12
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Rear end disc Well I spent 10 hrs on the rear end today and I still have no brakes. CPP's kit leaves a lot to be desired. No instructions as far as details, they have a sequence but no details. The spacers they have in the kit may are may not have to be used. Drivers side looks tight to me but they are on with spacers passenger side wouldn't go on at all so I called CPP and the answer was if they don't work don't use them! Nothing is mentioned in the instructions about not using them. I took them back off and it fit right up. The rotors are tight but I can spin them by hand and that's all they say. I'm hoping after driving it a little they will loosen up some after the pads are worn in. I may take the drivers side off again and use some shims instead of the spacer. Looking on the drivers side the caliper is up against the bracket, on the passenger side it has a 1/4" gap. The rear hard lines are for a Chevelle are Camaro they wouldn't fit my tee connection. Had to go get the fittings to adapt over to the bigger fitting. Called about that too! They said they sent the most popular size which is for a car not a truck. If you order this kit make sure you tell them you want the bigger fittings. Attached Images __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

11-01-2014, 05:18 PM	#13
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Rear end disc I have rear disc brakes on the truck. They still need some more bleeding I think though. I drove it home and had to tighten up on the pop valve some it was leaking. I guess I need to bleed them all again. The CPP kit would not be my choice again if I ever do another one that's for sure. The clips that hold the brake lines on the axle didn't even fit the hose fittings Attached Images __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

11-01-2014, 09:53 PM	#14
Kook87 Registered User Join Date: Oct 2014 Location: Tipton, In Posts: 59	Re: Rear end disc wilwood kits seem to be nice and complete and also I believe are the only ones with the integrated parking brake. __________________ Don't sweat the petty things and don't pet the sweaty things.

11-03-2014, 03:07 PM	#16
siroadrnr Registered User Join Date: Oct 2014 Location: Staten Island New York Posts: 15	Re: Rear end disc Andy, they look great on there. I hope they perform as well as they look. Most "kits" need tweaking, as you found out, but we always learn something in the process. Thanks for sharing!! __________________ "Its never too late to have a happy childhood." 70 Roadrunner,.. 79 Blazer, ..85 Harley bobber,.. 97 GMC Suburban Diesel,.. 99 Sierra, ..06 Ducati Monster Dark, ..07 Silverado ,.. 11 Audi A4

11-03-2014, 08:22 PM	#17
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Rear end disc The kit over all is OK not great but OK. The details are what I hate. I need to do some more bleeding I think. Driving it to work tonight the brake light on the dash would come on so I think I need to bleed the system some more and the pedal isn't that good either. I need to adjust the parking brake cable some more to. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

11-04-2014, 09:24 AM	#18
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: Rear end disc Andy - you may want to read these articles on adjusting the parking brake: http://www.classicperform.com/TechBo...oubleshoot.htm http://www.classicperform.com/TechBo...ot.htm#parking http://www.camaros.net/forums/showthread.php?t=73407 __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3



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11-12-2014, 10:09 AM	#20
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Rear end disc Andy, did you get the bugs all worked out of this? How is it stopping now? __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

11-13-2014, 02:52 PM	#21
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Rear end disc Hey Dave, yea I think I finally got them all bleed out and adjusted. I ended up having to take the drivers side back off and adjusting the e brake again but I think I have it. I drove it last night to work and it seems to stop pretty good. I can't tell a big difference in normal stopping but if I really mash the pedal it will stop darn quick. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

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