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Differential Fluid change

This is a discussion on Differential Fluid change within the Drivetrain forums, part of the LSx Technical Help Section category; Well im planning on doing my differential fluid soon so i wanted to see if anyone had any tips. I ...

  1. #1
    NIUK! NIUK!..WOO!WOO!WOO! LIGHTNINGMCQUEEN's Avatar
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    BLACK
    1999 TRANS AM

    Differential Fluid change

    Well im planning on doing my differential fluid soon so i wanted to see if anyone had any tips.

    I dont know what the guy before me put in it but im planning on putting 2 quarts 75w-90 mobil-1 gear lubricant. Is that a good lube too put in the diff?

    this will be my first time doing this with the diff but ive been reading up on it and watching some stuff online and it seems simple enough.
    Anything else i should put in? or something i should know about?

    Thanks!!!

  2. #2
    stupid snow! DOCJHH45's Avatar
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    pewter
    00 TA m6 vert

    ttt... I'm curious too

    What fluids types and additives is everyone else using?

    and how often are you changing it?

  3. #3
    Member
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    PEWTER
    2001 TRANS AM WS6

    NO ADDITIVE the worm gears dont need it 75 90 syn is the type of gear oil from the factory and I was changing mine every 9000 miles but the oil was free so now its been about 2 years I check it regularly and its clean I am planing on changing it befor summer

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    Nitrous Tuner LS2Tuner's Avatar
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    That guy thearborbarber's Avatar
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    White over Red
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    I run mobil 1 75-90 and catrol posi lube. I change mine once a year after it comes out of storage.

  6. #6
    Just me Y2KPewterSS's Avatar
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    Pewter metallic
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    Royal Purple 75-90
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    Something Diabolical... chuckie669's Avatar
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    2000 C5 Torch Red

    I just changed mine for the first time with RP 75-90. Came out nicely.

  8. #8
    Member jujofields's Avatar
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    Pewter Metallic
    2002 Trans Am WS.6

    I just changed mine too. IMO, Royal Purple 75-90 is the way to go! I change mine once a year, at the beginning of the year. With the Royal Purple, you don't need to put in the posi-trac additive that the manual says to. LIGHTNINGMCQUEEN & DOCJHH45, if you two want any additional tips or tricks to make things go smoother, just send me a message or a reply.

  9. #9
    Member One_Bad_TA's Avatar
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    Red
    2000 Trans Am WS.6

    I have a 00 Trans Am M6 with 100k miles. So for this fluid change should I get Royal Purple 75w-90 and a new gasket? And does this sound sufficient? Also there is no need for any additives?

  10. #10
    M6 King Hot Black Trans-Am's Avatar
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    I never thought the 10bolt was even worth a fluid change.

  11. #11
    Member One_Bad_TA's Avatar
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    Red
    2000 Trans Am WS.6

    Im kinda strapped for cash now and just want to do what ever i can to help keep everything goin good

  12. #12
    M6 King Hot Black Trans-Am's Avatar
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    09 EclipseGT 75 Chevy 4x4
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    Quote Originally Posted by One_Bad_TA View Post
    Im kinda strapped for cash now and just want to do what ever i can to help keep everything goin good
    I'd just keep it topped off. About the time you give it attention is when it'll break.

  13. #13
    Member One_Bad_TA's Avatar
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    Red
    2000 Trans Am WS.6

    I thought it would be better to change all the old stuff out and in with the new instead of mixing new with old. But im not an expert on this stuff

  14. #14
    M6 King Hot Black Trans-Am's Avatar
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    09 EclipseGT 75 Chevy 4x4
    2001 Trans-Am 13 F-XT

    Quote Originally Posted by One_Bad_TA View Post
    I thought it would be better to change all the old stuff out and in with the new instead of mixing new with old. But im not an expert on this stuff
    It is. I just don't like the 10 bolt.

  15. #15
    Member jujofields's Avatar
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    Quote Originally Posted by Hot Black Trans-Am View Post
    I never thought the 10bolt was even worth a fluid change.
    The stock rear is worth a fluid change...you should keep up the maintenance on any differential, regardless if it's stock or aftermarket...

  16. #16
    Member jujofields's Avatar
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    Quote Originally Posted by One_Bad_TA View Post
    I thought it would be better to change all the old stuff out and in with the new instead of mixing new with old. But im not an expert on this stuff
    You are right on the money with that line of thinking

  17. #17
    Member One_Bad_TA's Avatar
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    Red
    2000 Trans Am WS.6

    For the fluid and perhaps gasket how much am i lookin to spend? Also where to get them both? Autozone?

  18. #18
    Member jujofields's Avatar
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    Pewter Metallic
    2002 Trans Am WS.6

    I use Royal Purple differential fluid personally and highly recommend it for you too. By maintaining the differential, you're going to prolong the life of the rear. Also, when you take the cover off, you'll have the opportunity to make sure none of the gear teeth are chipped. If you're using a high quality synthetic like Royal Purple, you won't need to add the GM posi-trac additive as you would normally have to.

  19. #19
    Member One_Bad_TA's Avatar
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    Red
    2000 Trans Am WS.6

    Ok thats what i wanna get for it...Royal Purple. And did u replace the gasket on the differential?

  20. #20
    Member jujofields's Avatar
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    Quote Originally Posted by One_Bad_TA View Post
    For the fluid and perhaps gasket how much am i lookin to spend? Also where to get them both? Autozone?

    Autozone only carries Royal Purple engine oil; for some reason, they don't carry other RP fluids (like differential & tranny fluid). They do have the gasket for the 10 Bolt-the brand is Felpro. I believe the part number for the Felpro gasket is RDS 55072, but they can tell you for sure at the store. As far as the oil, I get mine online. If you're hard up finding the Royal Purple, I always have extra quarts on hand that I could sell to ya.

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