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What is my rear gear ratio?

This is a discussion on What is my rear gear ratio? within the Drivetrain forums, part of the LSx Technical Help Section category; I have a 2000 Z28 M6 and I dont know what the gear ratio is for the real differential. I ...

  1. #1
    Member camaroluvr447's Avatar
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    What is my rear gear ratio?

    I have a 2000 Z28 M6 and I dont know what the gear ratio is for the real differential. I think it might be a 3.73 but not sure. Any ideas? Thanks.

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    Moderator Firebirdjones's Avatar
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    Stock would be 3.42, unless it's been messed with.

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    Senior Member bills98ta's Avatar
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    Jack the car up at the rear, turn the tires one full turn & count the number of turns the drive shaft makes. 3 1/4 turns = 3.23 3 & almost 1/2 = 3.43 3 3/4 = 3.73 little over 4 = 4.11 ect...

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    Junior Member MarcusJ's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    Stock would be 3.42, unless it's been messed with.

    Is that the same for a 1999 Z28 with an A4? Thx.

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by MarcusJ View Post
    Is that the same for a 1999 Z28 with an A4? Thx.
    No the autos were a bit different. They had 2.73's standard or optional 3.23's.

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    Senior Member bills98ta's Avatar
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    My 98 TA came with 3.23's....

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    Senior Member bills98ta's Avatar
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    Quote Originally Posted by bills98ta View Post
    My 98 TA came with 3.23's....
    Then 3.43's, then 3.73's, then 4.10's, now I want 3.90's... LOL !!!

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