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Thread: For those doing Rear Diff Service

  1. #1
    silverws6ta's Avatar
    silverws6ta is offline Cadillac Owners Fanatic
    Automobile(s): '06 STS-V; '10 STS 1SG; '08 Escalade, '08 Escalade EXT
    Join Date
    Jul 2008
    Location
    Spartanburg, SC
    Age
    37
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    494

    For those doing Rear Diff Service

    I was down at my dealer earlier conversating with the head tech (became good friends) and while watching him change the rear diff in an STS and helping him get the exhaust back under the car -- he mentioned changing the fluid in mine to what he filled the new one with

    Dextron LS Gear Oil 75W-90, part #88862624

    Does not need the additive.. him and his dad are big Corvette folks -- and reccommended this for my V.. he said its greatly reduced some of the issues with clutches. Also I realized just how good he is because he changed the diff out in that car in about 45 minutes.. Lol

    Ironically just for info -- when one starts roaring/whining.. its replaced with a new one.. No core back to GM, no remanufacture.. new one goes in, old to the can.


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  3. #2
    youknooow is offline Cadillac Owners Enthusiast
    Automobile(s): STS-V 1 OF 3 BLK ICE & TANGO RED
    Join Date
    Dec 2010
    Posts
    634

    Re: For those doing Rear Diff Service

    How often should you change your fluid?

  4. #3
    550HP STSV Guest

    Re: For those doing Rear Diff Service

    I changed mine at 40k.

  5. #4
    youknooow is offline Cadillac Owners Enthusiast
    Automobile(s): STS-V 1 OF 3 BLK ICE & TANGO RED
    Join Date
    Dec 2010
    Posts
    634

    Re: For those doing Rear Diff Service

    Quote Originally Posted by 550HP STSV View Post
    I changed mine at 40k.

    So would you say every 40K? Did you notice any differences?


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