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Jack the rear end up and put it in neutral. Spin the tire one time and see how many turns the driveshaft makes.
3 and 3/4 turn is 3.73
a little over 4 is 4.10
3 turns is 3.08
Rather than mess with that, go ahead and remove the diff cover. You need to change the gear oil anyway. The ring gear will have a number stamped onto it, like 41 11.
divide those numbers.
Ratio is 3.73
-- Mike
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