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i tryed the way jeepster 376 said, and when i did mine i came out with just under 2 revolutions of the driveshaft... then i talked to a few guys and found out your supposed to multiply that by 2..... not 100% sure if that is correct but i never heard of gm making a rear thats under a 2.56:1 and with a 3 speed saginaw i couldnt get over 65-70 mph with 28.5 inch tall tires... so if i was you i would pull off the cover and check it out and then replace the fluid... but if you have a posi remember that some/most posi's require a certain type of fluid or an additive.
Rat
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