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gear oil in t56?

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  • gear oil in t56?

    My father has a 1994 base corvette. Hes been working on it I bought him some royal purple syncromax for his t56. About 1 month later. Maybe 500 miles or less he says it was hard to shift and changed the oil to a 80-90w gear oil. He now says it shifts better but I'm weary of that.

    Any input?
    2006 Suzuki gsx-r600, blue & white, Two brothers exhaust, K&N... for sale. $3,500 firm.
    1991 Ford Mustang GT, red, 5 speed, almost finished...

  • #2
    Hope he doesn't plan on driving it this winter.
    I hate change!

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    • #3
      I'm almost positive it uses dexIII ATF. It should have a sticker on the side of the Trans that says ATF ONLY.
      Sean Foster

      1.32 60ft
      6.30 1/8
      108 mph
      9.95 1/4
      133 mph
      Bluecat approved!
      383 AI 200cc/custom grind w/full bolton's. 4L80E w/edge 3600 stall, Moser 12 bolt w/4.10

      91' RS 7.88 8th 320rwhp 442rwtq

      "Wrong is wrong, even if everyone is doing it, and right is right even though no one else does it."

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      • #4
        Yes, it takes Dex III. Do not use Royal Purple anything. And the gear oil is going to ruin his synchros. Get it out asap.
        I know this is an old post but hope it's not too late.

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        • #5
          Thanks guys. I told him today. We've been out of town. He said he would change it before he drove it more.
          2006 Suzuki gsx-r600, blue & white, Two brothers exhaust, K&N... for sale. $3,500 firm.
          1991 Ford Mustang GT, red, 5 speed, almost finished...

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          • #6
            Looked in the owners manual. It says use 5w-30 motor oil.
            2006 Suzuki gsx-r600, blue & white, Two brothers exhaust, K&N... for sale. $3,500 firm.
            1991 Ford Mustang GT, red, 5 speed, almost finished...

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            • #7
              Looked in the owners manual. It says use 5w-30 motor oil.
              2006 Suzuki gsx-r600, blue & white, Two brothers exhaust, K&N... for sale. $3,500 firm.
              1991 Ford Mustang GT, red, 5 speed, almost finished...

              Comment


              • #8
                Yes for the engine. M6 Trans uses GM #88861800. Which is just a higher priced Dex III. I work in a GM parts dept. See it every day.

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