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Old 10-10-2010, 04:05 PM   #23
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Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
Re: Stock rear gear ratio info

Originally Posted by aintmisbehavinn View Post
I still don't know the ratio of the rear, it isn't printed anywhere, it's not a 307, it tachs and is the orig equipment.
If it is a C-10 you probably have a 3.73, but there is no need to guess about it.

Jack one rear wheel off the ground, put the transmission in neutral and the parking brake off. Put matching marks on the pinion yoke and differential housing. Turn the wheel exactly TWO revolutions and count how many times the driveshaft turns, estimating any fractional turn as closely as possible. That number is your axle ratio.

If the wheel is difficult or impossible to turn, you may have posi. In that case, jack both rear wheels off the ground and turn either of them only ONE revolution. Count the driveshaft turns the same way as for an open rear.


Last edited by raycow; 10-10-2010 at 04:08 PM.
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