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What gears do i have?

This is a discussion on What gears do i have? within the Drivetrain forums, part of the LSx Technical Help Section category; I bought the car used so I have no idea what gears are in the car. How do I find ...

  1. #1
    Member tg580's Avatar
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    1999 trans am

    What gears do i have?

    I bought the car used so I have no idea what gears are in the car.

    How do I find out?

  2. #2
    Nitrous Tuner LS2Tuner's Avatar
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    Jack the car up put the rear end on jack stands.
    Mark a line on the pinion yoke (where the drive shaft bolts).
    Now note something on the tire and while you are laying under the car watching your pinion yoke have someone spin the tire exactly 1 complete rotation. Now how many times did the yoke rotate and where did it end up.
    If it rotated 3 3/4 turns you have 3.73's etc.

    Don't be afraid of the bottle!!! Be afraid of your tune!!!

  3. #3
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    2001 Camaro Z28

    rpo code for the 3.23 is gu5 .and gu2 for 2.73s
    code is on the side of the door - i forget the one for 3.42's also depends on if its auto or not. rusty driveshaft = 2.73 aluminum driveshaft = 3.23 is another easy way to check

    hope this helps,

    Bill

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    3.42 is GU6. Can't always tell by the RPO though, could've been changed (mine says GU2 but replaced them with 3.42's). You can also try a RPM/MPH gear calculator like www.f-body.org/gears/

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    Member tg580's Avatar
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    1999 trans am

    I found out. they are 2.73's

  6. #6
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    Quote Originally Posted by 2001NBMZ28 View Post
    3.42 is GU6. Can't always tell by the RPO though, could've been changed (mine says GU2 but replaced them with 3.42's). You can also try a RPM/MPH gear calculator like www.f-body.org/gears/
    good point - just telling him the basics i suppose
    glad to see you found out

  7. #7
    Nitrous Tuner LS2Tuner's Avatar
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    Thumbs down

    Quote Originally Posted by tg580 View Post
    I found out. they are 2.73's
    That sucks highway gears from hell. . . . . . . . . . .

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