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Differential Fluid?

This is a discussion on Differential Fluid? within the General Help forums, part of the LSx Technical Help Section category; How do you add it to your car?...

  1. #1
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    Differential Fluid?

    How do you add it to your car?

  2. #2
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    NBM
    2000 Trans Am

    Fill plug is on the passenger side of the car directly in front of the rear axles at the pumpkin - use a 3/8 drive extension to screw it out and fill till it flows back out

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    pretty cool. Thank you!

  4. #4
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    Also make sure the car is level when filling.

  5. #5
    ORNGP33L 1BADDLS1's Avatar
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    Hugger Orange
    1999 Camaro Z-28

    Verify that the axle lubricant level is within the following range:


    No higher than the bottom of the plug opening
    No lower than 15 mm (9/16 inch) below the plug opening
    If necessary, add to or replace the axle lubricant. Use synthetic 75W-90 gear lubricant (GM P/N 12378261), meeting GM specification 9986115, or equivalent.

    If the vehicle has a limited slip differential, add 118 ml (4 fl oz) of limited slip differential additive (GM P/N 1052358), or equivalent

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    Im assuming the diff. fluid is the lubricant right?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    SILVER
    2004 CTS-V

    Quote Originally Posted by shlby123 View Post
    Im assuming the diff. fluid is the lubricant right?
    Yes, its the lubricant.

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    candy red
    98 Camaro Z28

    What weight to use and will royal purple be the differential fluid?? I have never changed it on my 81k Camaro and was wondering if it would be worth to change it.

  9. #9
    Nitrous Tuner LS2Tuner's Avatar
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    Quote Originally Posted by CandyRedZ28 View Post
    What weight to use and will royal purple be the differential fluid?? I have never changed it on my 81k Camaro and was wondering if it would be worth to change it.
    Yes I would..... Royal Purple's is called Max-Gear. It's not # like plain jain fluid. You will gain gas milage do to loss of friction. And even better yet there is NO need to add any friction modifier cause it already has it.

    Heres a link if you want proof of the truth.....
    http://www.royalpurple.com/prodsa/mgeara.html
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

  10. #10
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    I'm gonna have to hunt it up again to be completely positive but I think rears with clutch type posi's aren't recommended synthetics. I think you can run synthetic in the cone types but not the clutch types. I know my strange rear is not recommended to run synthetics.

  11. #11
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    candy red
    98 Camaro Z28

    So what do i got, mine is a 98

  12. #12
    Nitrous Tuner LS2Tuner's Avatar
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    Quote Originally Posted by 0rion View Post
    I'm gonna have to hunt it up again to be completely positive but I think rears with clutch type posi's aren't recommended synthetics. I think you can run synthetic in the cone types but not the clutch types. I know my strange rear is not recommended to run synthetics.
    Stock GM clutch type are ok with sythetics. They call for a GL-5 type oil. Or at least everyone I've ever dealt with has.
    This is from R.P.
    "Max-Gear is recommended for use in truck, motor home / RV, and automotive front or rear differentials, manual transmissions and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid."

    "All viscosities of Max-Gear are formulated with hypoid friction modifiers necessary for use in clutch or cone type differentials. No additional additives are necessary."

  13. #13
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    Black
    2002 Camaro ss

    Thumbs up

    I would change it ASAP.

    It is great insurance, and the rear ends in these cars are weak to begin with.
    I'm just about to buy a rear end cover that has a drain plug in it so fluid changes can be easy. SLP offers one and I believe a company that sells Trans-am parts has a good one as well. (don't know the name of this co.)
    Good peace of mind to have new fuild in her .

    All the best to you.

    jess .........

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