The gear ratio of both 12x50 and 18x75 is 4.166666666666667 which is the same. But why don't car manufacturers use only one of them while the ratio is exactly the same?

My only guess is that when the number of teeth are lower, the gears are stronger (can withstand more torque) but they are noisier.

Can someone please shed some more light on this?

  • Depends on the differential housing and application what teeth combination they use, 12x50 is definitely stronger – Moab Feb 14 at 21:50

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