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GM 10 Bolt Rear Gear Install & Setup

Discussion in 'Gear Central' started by Bigredmariner, Oct 24, 2010.

  1. WILLBURN

    WILLBURN I'm NEW... What now?

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    8.5 inch stock rear diff...

    Hello all, I could use a hand on this please.

    im working on a 96 suburban k1500 4x4....im troubleshooting some noise and have rear diff drained/open. My main concern is when I have rear wheels off ground and push and pull axles in and out there is a good amount of play that is accompanied by a clunk as I mate surfaces on in and out push/pull. This is the first obvious area I have found sound or looseness to produce sound in my troubleshooting to find the clunks I have.

    the clunks I have are on beginning of accel and end of decal....and it sounds more to drivers side axle.

    now the end of my axles on the inside of the diff are c clip style inside 4 spider gears. the pinion shaft/pin blocks the axles from moving inward enough to get clips off....now I know I pull this pin to push in axles to pull c clips....but my problem is prior to removing the pinion shaft to get clips off....I had someone push and pull on axles on each side . The axles bang in and out. From the inside end of the axle to the pinion shaft/pin in middle has a lot of space that is allowing the in and out movement. So....what is the normal play here? Maybe it wasn't shimmed properly behind spiders or carrier sides?

    I think my forward backward backlash for ring gear/pinion is ok, but could appreciate a quick tip on checking it. I have tools, and I am a mechanic, I just have never had to rebuild a rear end in my life. I have a dial indicator as well.


    ***im fixing a friends truck who just took it to a mechanic and supposedly had this issue repaired. he picked it up and it was doing same thing. mechanic said he did center bearings....????? no center bearings in unit/?? pionion, side bearings and axle bearings are all I know of here. So he might be lying...until and if I pull this apart...ill inspect for new parts then.
     
  2. Coyotegray

    Coyotegray I'm NEW... What now?

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    Great write up! I joined after reading it.
    I'm doing the same to my 2006 Tahoe. I started to tear it down but an ice storm came through so I'm left inside, prepping the new differential.
    Since I haven't removed the old differential yet, a question I have is the races for the carrier bearings go on the outside, correct…?
    The shims are on the outside also, correct...?


    Thanks,
    Andy..


     
  3. Bigredmariner

    Bigredmariner Administrator

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    Welcome aboard, yes shim go on the outside of the carrier races. If you can see the area where the brass punch is, the shim has a little yellow paint smear on it.




    Posted from my iPad via Tapatalk HD.
     

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  4. C.parry95

    C.parry95 I'm NEW... What now?

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    Awesome write up!!

    First off, thank you so much for all the pics and detailed instructions!! My g80 finally let go at 234,000 miles. Just one question..

    Do I set the backlash with the carrier bearing preload set? I read another forum saying to set the carrier preload after setting backlash... I set my backlash with preload and it's perfect right now.

    I am still working on getting the pinion shim right. I have done a few gear pattern passes and I haven't got it quite right yet. I need to stop by the GM dealership later and grab some more marking compound. I already ran out of the tiny amount that came in the installation pack.
     

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  5. kennythewelder

    kennythewelder B31-3 (6 G ) certified

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    As mentioned on this forum, I need to rebuild my diff. I found this thread doing my research on Yahoo. Already being a member here, I was glad to see a very good write up on this subject. I have never done a pinion setup but have been inside of my diff before. This thread is perfect for me, as I have a GM 8.5, 10 bolt 30 spline, and I am going from 342 gears to 373 gears, also I am going from an open carrier to an Eaton truetrac. I wanted to post something here to revive this old thread. Here is a link to my thread on rear end hum.
    https://www.truckmodcentral.com/threads/rear-end-hum.31374/#post-1239256
     
    Last edited: Feb 7, 2021
  6. kennythewelder

    kennythewelder B31-3 (6 G ) certified

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    The more I read through this thread, the more awesome it becomes. Fantastic write up.
     

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