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Thread: just a reae end gear math question ???

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    Jul 2003
    Chelsea Oklahoma

    just a reae end gear math question ???

    if i had a 3.90 gear with 36 tall tires and went out the back door on a 1/4 mile at 144 mph and 6100rpm what would 4.57 gears on a 1/4 mile be ???

  2. #2
    Senior Member MASTER BUILDER
    Join Date
    Jul 2004
    Elm Mott, Texas
    Depending on if you shifted at the same point I would guess around 7000. Go to and he has all types of calculators for changing stuff.
    Wasn't me.

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