First Gear: 3.625:1 Second Gear: 2.043:1 Third Gear: 1.394:1
Fourth Gear: 1.00:1 Fifth Gear: 0.853:1 Reverse: -4.039:1
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Short answer, the number of driveshaft rotations to achieve one
full rotation of the axles. E.g, a truck with a 3.55:1 gear ratio
requires 3.55 turns of the driveshaft to turn the axle shafts one
full rotation.
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Reduction ratios:
1st gear 2.45:1
2nd gear 1.45:1
3rd gear 1:1
Overdrive 0.69:1
Reverse 2.22.1
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The best way is to count the teeth on the ring gear and divide
by the number of teeth on the pinion gear. Or you can count the
number of turns of the pinion it takes to get one full turn of the
ring gear. For example, if we divide a ring gear with 41 teeth by a
pinion gear with 10 teeth we find that the gear ratio is 4.10:1
(41/10 = 4.10).