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Thread: Rear diff. not locking in!

  1. #1
    Join Date
    Mar 2005
    Location
    Baton Rouge, La.
    Posts
    28

    Question Rear diff. not locking in!

    Normally I have no problem in the mud w/ my 4X4, but I have gotten myself stuck twice this week. Come to find out the reason why is my rear end is not locking in as normal. I have never had a problem in 327,000 miles w/ plenty of off road time. All fluids are checked and changed on regular basis. Can anyone suggest what might be going on? Thanks,
    Hot shot driver<br />2004.5 2500HD 4X4(RPO LLY)<br />Over 160,000 on truck!<br />4\" Exhaust, AFE intake, Edge w/ Attitude.

  2. #2
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,382

  3. #3
    Join Date
    Mar 2005
    Location
    Baton Rouge, La.
    Posts
    28

    Default

    Thanks Jim, is this something easily replaced? I've never pulled the rear cover to get a good look at the internal make up. I use Lucas gear oil in both my diff. and the fluid still looks pretty good. Could I need to try and change out the fluid and clean it all up. Or more than likely the disc are just work out? Thanks,
    Hot shot driver<br />2004.5 2500HD 4X4(RPO LLY)<br />Over 160,000 on truck!<br />4\" Exhaust, AFE intake, Edge w/ Attitude.

  4. #4
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,382

    Default

    The G80 locking rear diff I have experience with is not easy to work on. A drivetrain mechanic friend and I took a AAM-950 GM corporate rear G80 apart a few years ago to replace the spider and axle-end gears. It was a pain. While in there, I saw the clutch discs, and they would have been easy to replace - once you get it apart.

    The following image of an AAM-1150 rear diff was taken at Randy's Ring & Pinionin Everett, WA. It was removed from a GMC 2500HD. Not sure if this is a locking G80 or not.



    Jim

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