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How Can I Tell What Gears I have

This is a discussion on How Can I Tell What Gears I have within the Drivetrain forums, part of the LSx Technical Help Section category; I bought my car used, how do I know if the rear gears are already upgraded? Rear seems to be ...

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    Member Doom's Avatar
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    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 ?

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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.

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    Member Doom's Avatar
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    Newark here

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

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

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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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