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rear axel ratio

This is a discussion on rear axel ratio within the Drivetrain forums, part of the LSx Technical Help Section category; i was wondering if someone could tell me the benefits of a 323 rear and a 342 rear and could ...

  1. #1
    Junior Member Trans Am Ws6 Man's Avatar
    Join Date
    May 2011
    Lansdale PA

    2000 Trans Am

    Question rear axel ratio

    i was wondering if someone could tell me the benefits of a 323 rear and a 342 rear and could somebody tell me why the 323 was called a rear performance axel ratio what could you do differnt

  2. #2
    Senior Member
    Join Date
    Jul 2005
    Jacksonville, FL
    Performance axle (3.23) was an upgrade option from the 2.73 with steel driveshaft on the A4 cars. 3.23 also has a 3 series carrier and alum driveshaft, 2.73 a 2 series. 3.42's and alum driveshaft were standard on the M6 cars. My car originally came with 2.73 and I swapped in a 3.42 complete rear from a M6 car. Hope this helps, not sure what you're asking.

  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    3.23 is simply the ratio which is better expressed as 3.23:1. That means that it takes 3.23 turns of the driveshaft to make the rear tire go around 1 time. Performance ratios are always numerically higher -- in our automatic car a 3.73 rear is considered a good axle ratio. M6 cars, because of the better overdrive gearing, generally utilize 4.10 gears in the rear for performance.

  4. #4
    Junior Member midnitejam's Avatar
    Join Date
    Oct 2006
    Parma, Ohio

    1998 WS6

    With 4.56 gears and a 6-speed, pulling out in 2nd gear would almost as easy as pulling out in 1st gear with a 2.73 gear set. Clutches last longer when used with 4.10's, 4.30's. 4.56's, etc

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