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What brand of gear oil/tranny oil to use?

This is a discussion on What brand of gear oil/tranny oil to use? within the General Help forums, part of the LSx Technical Help Section category; I want to change the gear oil and the transmission oil in my 6spd t/a. I would like to stick ...

  1. #1
    Member
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    2001 Trans Am

    What brand of gear oil/tranny oil to use?

    I want to change the gear oil and the transmission oil in my 6spd t/a. I would like to stick with the the fluid that GM uses. What brand do they use? Do I have to get it at a dealership? How much $$ am I looking at? I just don't want to get screwed over too bad.

  2. #2
    That guy thearborbarber's Avatar
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    White over Red
    1991 Suburban

    I use mobil 1 in the rear diff. and regular texaco dexron III in my tranny.

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    Senior Member INMY01TA's Avatar
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    2001 Trans Am (sold)

    Any Dexron III will work for the tranny. Dealership will sell you AC Delco fluids. I use Redline D4 synthetic ATF in the tranny and any dino 80/90 gear oil in the diff.

  4. #4
    Asshole bige97's Avatar
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    no one uses royal purple? is that a good oil or not

  5. #5
    Member va2001ss's Avatar
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    2001 Black SS #5228

    Whatever you use DO NOT use the new DEX VI. It will cause damage to our T56's.

  6. #6
    Nitrous Tuner LS2Tuner's Avatar
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    Quote Originally Posted by bige97 View Post
    no one uses royal purple? is that a good oil or not
    It's ok. We use AMSOIL in all the race cars. I also use the RedLine in the rear ends with the clutch type posi's.

    The synthetic blends withstand heat alot better.

    The fluid your talking about is GM's Syncromesh part #12345349 you should be able to get it for 9.99-12.99 a quart.

    Penzoil makes a direct copy which is cheaper and Tremec will tell you to buy it.
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

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