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  1. bearboley

    M915A1 gear change

    I run 4.33's in my everyday truck with a 400 Cummins and it tops out at 78, but I have 11r24.5 tires and a 13spd. I get 6mpg with this combo and it goes up mountains like it has a rocket on the back. I agree with wreckerman the trans is the limiter here. Bolt a set of 11r24.5's on it you will...
  2. bearboley

    M915A1 gear change

    Engine RPM x 60 / (Axle Ratio x Tire Revolutions per Mile x Transmission Ratio) = Top Road Speed (MPH) 3.36 Gears would be way too high at 2100 rpm road speed would be 75mph. 4.11 gears would give you a road speed of 60mph at 2100rpm.
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