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which factory rear end do i have?

This is a discussion on which factory rear end do i have? within the Camaro / SS forums, part of the Vehicle Specific category; i have a 02 z28 and i was told that i have a stock 3.73 im wondering which rear end ...

  1. #1
    Senior Member greatwhiteZ28's Avatar
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    which factory rear end do i have?

    i have a 02 z28 and i was told that i have a stock 3.73 im wondering which rear end i have cause when im cruizing at like 75-85 mph my tach is almost at 2700-3000 rpm . how can i tell help

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    I went to Playboy Mansion FantaZGuy28's Avatar
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    04 GTO M6

    If you have an A4...then you would have higher gears than 323's because at 80mph im below 2500 RPM's. You might have 342's if the previous owner blew his rear end and found a M6 Fbody.

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    Member Allen Wood's Avatar
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    I have a 3:73 gear along with an A4. At 60 MPH the RPM'S will be 3000 with the trans in D. Hope this helps.

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    Look at the calculator at www.f-body.org/gears/

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    Just me Y2KPewterSS's Avatar
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    Quote Originally Posted by greatwhiteZ28 View Post
    i have a 02 z28 and i was told that i have a stock 3.73 im wondering which rear end i have cause when im cruizing at like 75-85 mph my tach is almost at 2700-3000 rpm . how can i tell help

    GM didn't put 3:73 rearends in fbodies from the factory. If your car is a T-56(6 speed) transmission then you have a 3:42 rearend. If your car is a 4l60E(automatic) transmission then you have a 3:23 or 2:73 rearend. The calculator link listed above should determine for you which rearend you have. You could also look at the RPO codes on the driver side door and determine your gearing.
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    Senior Member SeVeReDiStOrTiOn's Avatar
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    00 Z28 sold :-(

    Also if a previous owner did put aftermarket gears in your speedo could be off...might wanna check that out.

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    Junior Member 99Ztwenty8's Avatar
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    1999 Z28 M6 Vert

    I have a 99 M6 and in sixth gear my rpm's are at 2100 when doing 90

  8. #8
    Member Corey1987's Avatar
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    that sounds about right for a m6

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