"rough" estimate is to mark the tire and turn the pinion(or driveshaft and count the number of rotations of the pinion/driveshaft needed in order to get one full revolution. If it takes a hair over 3 revolutions of the driveshaft to get one full tire revolution....you have roughly 3.08 gears.

your truck probably has maybe 4:57 or there about...


you might find a tag or stamp on the rear axle/pumpkin saying what you have

Last edited by joker; 08/22/2013 5:23 PM.
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