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Differential & Final Drive

Open and limited slip differentials, propeller shaft, universal joints, rear axle.

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Q1 · Differential & Final Drive · HARD
In a bevel gear differential with a crown wheel having 48 teeth and a pinion having 12 teeth, what is the final drive ratio?
Q2 · Differential & Final Drive · HARD
In a differential mechanism, if the drive pinion has 12 teeth and the crown wheel has 48 teeth, and the engine transmits power at 3000 rpm to the pinion, what is the final drive ratio and the crown wheel speed?