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  1. #1
    Member Doom's Avatar
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    89 BII, 02 SS

    How Can I Tell What Gears I have

    I bought my car used, how do I know if the rear gears are already upgraded? Rear seems to be worked on, any way of telling exactly what my ratios are ?

  2. #2
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    Quote Originally Posted by Doom View Post
    I bought my car used, how do I know if the rear gears are already upgraded? Rear seems to be worked on, any way of telling exactly what my ratios are ?
    jack the rear up and put it in neutral. with one rotation of the back wheels see how many times the drive shaft spins. 3.73's would be about 3 and 3/4 times. not exact but pretty close. where in nj are you. metuchen here.

  3. #3
    Member Doom's Avatar
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    silver
    89 BII, 02 SS

    Newark here

  4. #4
    Member Bearcat's Avatar
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    Machine Silver
    2004 C5Z06 Corvette

    You will need to look on your driver side door and look at the RPO codes...

    http://autorepair.about.com/library/...bl574a-lib.htm

  5. #5
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    See if your RPM matches the MPH using a calculator like www.f-body.org/gears/ Can't always trust the RPO codes, mine came with 2.73 but has 3.42's now.

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