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How do you figure the gearing ratio of the differential?

I have 3 T's, with one rear wheel jacked up and the transmission in high, it takes just under 2 revolutions of the starting crank to make the rear wheel turn one revolution.

That would seem to be about 1.8:1 ?

If I double it, that would be 3.6:1

What don't I understand about this?

I'm confused

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With only one rear wheel lifted, the differential will give the free wheel double speed, doubling the ratio. Std ratio is 3,64:1 or 40/11. Thus with only one wheel turning you'll get 1,82:1, though never in real driving.

Here's a good video explaining the diff so even Chevy guys can understand it ;)

https://youtu.be/yYAw79386WI

(Message edited by Roger K on May 04, 2016)