4H and 4L Gearing

Discussion in 'Drivetrain Tech' started by Covekid00, Oct 7, 2019.

  1. Covekid00

    Covekid00 New Member

    I have a 98 3.0 5spd with the 7.5 axle and 3.73 ratio. I'm wondering what the ratio changes to when you switch from 2/4 high to 4low.
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  3. DeanMk

    DeanMk Member

    According to what I can find, your transfer case is a BW 1354 with a 2.48:1 reduction in low range.
    Your M5OD-R1 transmission has a 3.72:1 reduction in first gear and you've already noted your axles are packed with 3.73's.

    ...now all we need to do is multiply....

    3.72 x 3.73 = 13.8756:1

    ….that would be total gear reduction, high range...

    13.8756 x 2.48 = 34.411488:1

    ...that would be total gear reduction, low range...

    If you want to know what this translates to in MPH, you need post your engine's low idle RPM and I need to know the height of your tires.

    Last edited: Oct 7, 2019

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