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#1 |
Registered User
Join Date: Jun 2007
Location: South Carolina
Posts: 106
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12 bolt rebuild + eaton
About four years ago I did a LS engine swap on this truck and have done way too many single tire burn outs and have been wanting to do a good posi ever since.
I have set up about a dozen rear ends and have never had a noise or problem with any of them (knock on wood). I'm going to do a simple how to on this with pictures to hopefully help some one here out. I'm no expert and any input is welcome. The first thing you will notice when ordering parts is there is a 3 or 4 series. The 3 series is for 2.76 - 3.42 gear ratio and the 4 series is for 3.73 up. The difference is the thickness of the diff. The 3 series eaton is cheaper than the 4and you can order a "thick" 3.73 up gear to go on the 3 series. My truck came with a 4 series 3.73 but since I'm doing a complete rebuild I orderd: 3 series eaton #19587-010 $425 Ebay Motive gear thick 3.73 #mgr-gm12-3.73x $169 summit rebuild kit # rat-3005k $109 summit I decided to do the 3 series so I had the option of running any ratio with out replacing the most expensive piece. [IMG]htt ![]() |
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#2 |
Restoration Virgin!
Join Date: Jan 2008
Location: Huntersville, NC
Posts: 8,298
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Re: 12 bolt rebuild + eaton
okay David....I'll be following along....
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Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present |
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#3 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: 12 bolt rebuild + eaton
Quote:
__________________
New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#4 |
Registered User
Join Date: May 2011
Location: mich
Posts: 655
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Re: 12 bolt rebuild + eaton
Yes please do one I'm IN I'M IN Getting ready to do one this fall, Series 4 with 4.10 gears 28inch tall tires. Right now it has a open diffy sreies 3- 3.08
My biggest concern if I'am correct is with the shim behind the pinion bearing. I hate the thought of pressing the bearing on and off until I get the right shim in place. ![]() ![]() |
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#5 |
454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: 12 bolt rebuild + eaton
It's weird how this works sometimes, I've already got a posi with 4.11's but am in bad need of a rebuild, and just got round to asking the tech guys at Drivetrain.com what I need, and they just sent me the details today
I was going to start the tedious task of searching the net for 12 bolt rebuild info, when, here you are in my very own back yard about to do it....Cool! & thanks for doing this...please take lots of pics. Here's the list they sent me. We can provide the following parts for your 12 Bolt differential: Ring and pinion matched set part number MWGM12-411 your cost is $209.94 Master bearing installation kit part number MWR12RMK including pinion bearing, pinion seal, pinion nut,crush sleeve, carrier bearings and races, new ring gear bolts and gasket your cost is $98.00 New Eaton positraction part number MW19556-1 to replace gov lock positraction your cost is $469.99
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Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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#6 |
Has more rust than truck...
Join Date: Apr 2005
Location: Ivanhoe, MN
Posts: 2,421
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Re: 12 bolt rebuild + eaton
DavidB posted his write up in engine and drivetrain, Thanks David!
Link: http://67-72chevytrucks.com/vboard/s...d.php?t=484897 |
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