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How do i tell what gears are in the rear end?

This is a discussion on How do i tell what gears are in the rear end? within the Drivetrain forums, part of the LSx Technical Help Section category; just got a rear from the junk yard they say its 3.42 gears but i need to know for sure ...

  1. #1
    Member barryTA's Avatar
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    How do i tell what gears are in the rear end?

    just got a rear from the junk yard they say its 3.42 gears but i need to know for sure how do i tell where do i look for the numbers?

  2. #2
    Senior Member Danger731's Avatar
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    I know old school had the numbers on the drivers side of the axel facing down.

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    GM usually stamps it on the edge of the ring gear. Just count the teeth on the ring and pinion and do the math. For example:

    42 tooth ring gear, 13 tooth pinion gear - 42/13 = 3.23

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    Senior Member bigrondownhiller's Avatar
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    You could also turn the axles and count how many times the pinion turns in relation to the axles. If the pinion turns 3 and a half for one revolution of the axle you have 3.42.

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