Thread: Rear end ratio

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Is there a way to determine the ratio by counting revolutions of the drive shaft and tire? No tags on the rear end. S10 Blazer.

Ring Gear - Pinion Gear Ratio Calculator CLICK..............

Thanks for the reply! I saved it for the future.

If the rear is a posi, jack up the rear, mark the bottom of the tire and the bottom of the driveshaft and turn the tire one revolution while counting how mwny times the driveshaft goes around.

If ti's NOT a posi, do the same thing with the vehicle slowly rollin forward on the ground.

Or, you could pull the rear cover anf count the teeth.

Yep, I've got an S10 rear in the 23, non posi and I simply put a mark on the tire and on the driveshaft then rolled it forward and counted the driveshaft and tire revolutions. Mine ended up a 3:00, which seems high, but worked out perfect.

Don

Just keep your head out from under the tire as you count

Originally Posted by cffisher

Just keep your head out from under the tire as you count

Uh huh, sounds like the voice of experience, Charlie.

Don

If it's an open rear end, jack up one wheel and turn it two turns, counting the driveshaft turns.

Originally Posted by R Pope

If it's an open rear end, jack up one wheel and turn it two turns, counting the driveshaft turns.

That's the right way to do it

OK so if the rear end is supposed to be a 323 how does that equate to revolutions?

Originally Posted by sfort

OK so if the rear end is supposed to be a 323 how does that equate to revolutions?

3¼ will get you there.

Mike

Thanks guys it is about 3 1/3 drive shaft revolutions v.s. 2 tire revolutions. Now I need start a new thread to address wheel back spacing.