The best way is to pull the cover off & count the teeth or look at the markings on the edge of the ring gear or end of the pinion. It will have numbers like 9-41 or 8-31. Divide the numbers to get the ratio. You can count the number of turns on the drive shaft to turns of the drum but if you can,t keep both wheels turning together it gets confusing. Those are two different kinds of rear ends. I am considering the same swap & I think they are interchangable.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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