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rear diff

This is a discussion on rear diff within the Drivetrain forums, part of the LSx Technical Help Section category; Hi , what size is the rear end in my 99 ws6 ? 7.5 ? or 8.5 ? thanks...

  1. #1
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    rear diff

    Hi , what size is the rear end in my 99 ws6 ? 7.5 ? or 8.5 ?
    thanks

  2. #2
    None Shall Pass Knight's Avatar
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    99 WS.6 - Modified

    7.5

  3. #3
    Veteran Hi-Po's Avatar
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    1999 TA WS.6

    7.5

  4. #4
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    rear diff

    Cool, so what interchanges with it ? and what are the GM codes for gear ratio ? so is the s-series truck the same center section ?
    Last edited by Butch2000; 03-23-2010 at 05:24 PM.

  5. #5
    None Shall Pass Knight's Avatar
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    99 WS.6 - Modified

    What do you mean by interchanges with it?

    GU2 - 2.73
    GU3 - 3.08 v6 gear
    GU5 - 3.23
    GU6 - 3.42

  6. #6
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    well mine howls , I can't find any in my area , but I have a s truck with 3;73 , in it and it's a 7.5 , 31 spline , ? so will the guts fit ?
    Last edited by Butch2000; 03-23-2010 at 05:39 PM.

  7. #7
    Member Baluchitherium's Avatar
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    It has a big wing!

    When I had my 98' TA the rear would randomly howl at low speeds.Like when driving around a parking lot.

    I changed out the fluid and never had a problem after that...

    Just a thought,hope you get your situation worked out.

  8. #8
    Member Numba1TA's Avatar
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    1999 Trans Am WS6 A4

    if its howling it could also be a bearing. drain the fluid and see if there are any metal shavings

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