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Stock T56 and 4.30 rear diff

This is a discussion on Stock T56 and 4.30 rear diff within the Manual Transmission forums, part of the Drivetrain category; I am converting my 3rd gen RX7 to a LS1/T56 drive train. I have 4.30 rear gear in the car ...

  1. #1
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    Stock T56 and 4.30 rear diff

    I am converting my 3rd gen RX7 to a LS1/T56 drive train. I have 4.30 rear gear in the car now that worked real well with the stock mazda tranny and a 5th gear from a mazda suv.

    This is a road course car.

    Anyone speculate what I might expect with the 4.30 with the T56?

    Should I go back to the stock, I think 3.90 rear gear?

  2. #2
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    The only possible downside I can see would be traction issues. Otherwise that gear is well suited for a LS1/T56 combo.
    If you do have traction issues that you can't solve with tires and suspension mods, then go ahead and try the 3.90 gear

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