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#1 |
Registered User
Join Date: Mar 2007
Location: ohio
Posts: 11
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12 bolt rear end rebuild
i had a 9 second mustang that i just sold. i thought long and hard on what my next project would be and i chose a 72 chevy truck. i bought a frame that came with a 12 bolt. i helped my friend rebuild his 9 inch, but obviously this is a whole different animal. i guess what i am getting at is i am not completely ignorant when it comes to rebuilding one, yet i would like to have some literature to be able to read through as i am doing it. i haven't even torn into this thing yet, but i know it is going to be alot different not being able to take out the pig and all. i haven't had too much luck locating any manuals, and was just wondering if anyone had any books that they would suggest, and where i can buy them. thanks
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#2 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: 12 bolt rear end rebuild
Welcome to the board from West Michigan!
The truck overhaul manuals have a good section in them on the 12 bolt rear and the 67 truck version is available at this site: http://www.gregsonline.com/ Manuals do come up for sale and you may be able to find a used one for your year truck. Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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#3 |
Registered User
Join Date: Mar 2007
Location: ohio
Posts: 11
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Re: 12 bolt rear end rebuild
thanks alot for your help
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#4 |
Active Member
Join Date: Apr 2005
Location: Miami, Florida
Posts: 286
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Re: 12 bolt rear end rebuild
I just had my 12 bolt rebuilt, it was originally a one wheel peel. I got my parts from DTS in Michigian here is a web site drivetrainspecialists.com These guys were all over it answering questions before i even had a chance to ask them
![]() Gm 8.875 bearing kit Eaton series 3 carrier GM 3.08 ring and pinion 12 Bolt Truck Aluminum Cover Installation was relativly simple, all the parts were there and complete Good luck, -Fred Last edited by KFreddy; 04-10-2007 at 09:39 AM. |
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#5 |
Registered User
Join Date: Mar 2007
Location: ohio
Posts: 11
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Re: 12 bolt rear end rebuild
i really do appreciate the help.......i ordered the book jim. the website is now in my favorites fred.
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#6 |
Registered User
Join Date: Jan 2006
Location: Kaufman, Tx
Posts: 827
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Re: 12 bolt rear end rebuild
Also, check out Richmond's and other gear manufacturers websites. Look for their instructions on setting up the gears. I printed out about three sets of them from different sites, looked over them for a couple of nights, and dove in. It all went pretty smooth. But I had the rear end out of the truck too. It would have sucked trying to do my first one while in the truck, that's where that 9" comes in handy.
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You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape. If a hammer doesn't fix it, you have an electrical problem! Slot Cars, 1:24 Scale, 100MPH@100,000RPM, fastest things on wheels! ![]() |
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#7 | |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,118
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Re: 12 bolt rear end rebuild
Quote:
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#8 |
Active Member
Join Date: Apr 2005
Location: Miami, Florida
Posts: 286
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Re: 12 bolt rear end rebuild
Greg,
Yikes don't remind me, yes the original axels, 6 cylinder truck with a 12 bolt rear, with a bit of prayer and some duck tape I might be in the clear ![]() |
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#9 |
100% gearhead
Join Date: Apr 2007
Location: Boise, Idaho
Posts: 313
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Re: 12 bolt rear end rebuild
Hey guys, guess what my day job is!? I rebuild rerends at Jim's Drivetrain Specialties here in Boise, Idaho. I dont see what all the fuss is about over using your stock axles KFreddy. As long as they arent bent, flaking or grooved, you're good to go. There is no difference in the internals of a 12 bolt between motors. As far as rebuilding these goes, it is a fairly straight forward deal. Some important guidelines to remember, whether you know or not.
Never mix your caps side to side. Don't over crush the crush sleeve. It's only a matter of inch-pounds of preload on the pinion bearings that you want. Especially if you switch gears or the carrier, the side shims usually won't fit correctly in their respective positions. when you order parts, ask for some "Super Shims". These are stackable shims and make this step really easy. The side shims should just fit snugly into the housing, tight enough though that a hammer is required to tap them all the way in. You should not be able to remove the carrier by hand. Always re-use the stock pinion shim (if it is in good shape). Backlash on these should be .008-.012., and everything should spin with some resistance and quietly. Keep all this crap in mind, and it should go really smooth. |
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#10 | |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,118
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Re: 12 bolt rear end rebuild
Quote:
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#11 |
Registered User
Join Date: Dec 2006
Location: Rhode Island
Posts: 602
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Re: 12 bolt rear end rebuild
Check out www.chevelles.com for their on-line monthly mag called Chevy Punch".
This month was all about setting up a 12-bolt. I think you'd find it helpful.
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69 C-10 SWB Fleetside 454/TH400 (For Sale) http://67-72chevytrucks.com/vboard/c...ct=1299&cat=12 70 El Camino 454 TH700 29 Model A 4-DR Sedan Deluxe |
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#12 |
Registered User
Join Date: Dec 2009
Location: Kirkland, WA
Posts: 1,302
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Re: 12 bolt rear end rebuild
Awesome (really old) thread! I was surprised to come up with very few good posts about rebuilding the 12 bolt. Any new info/resources out there? I see rebuild kits on ebay for like $90 shipped with koyo(?) bearings, are they any good?
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1968 LWB C20 / AC / Wood Bed |
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#13 | |
Happy to be here
![]() Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
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Re: 12 bolt rear end rebuild
Quote:
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Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra" |
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#14 |
Registered User
Join Date: Dec 2009
Location: Kirkland, WA
Posts: 1,302
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Re: 12 bolt rear end rebuild
The closest I could find to a rebuild guide is an article from "Chevy Punch" but it is for a car 12-bolt. Probably the same exact procedure though. I attached the pdf for reference.
Edit: the file is way too big for the tiny filesize limits here, so here is a direct link! http://www.chevypunch.com/issues/march2007.pdf
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1968 LWB C20 / AC / Wood Bed Last edited by crakarjax; 02-17-2011 at 12:33 PM. |
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