If they are a matched pair, and if you are lucky there may still be a tag under one of the cover bolts on either diff.
Also you most likley don't have a 10 bolt front. If those axles are that old it should be a Dana 44 front.
On a 10 bolt at the diff on the pass side 1 of the pinion supports would come way out to impact a stopp mounted to the frame on the truck. If you don't have that large flat fin then you mostlikley have a Dana 44.
correct, if you have a 75, and it's stock, you don't have a 10 bolt. they were offered until 77.
if you have an SM465, you probably have 3.73, or 3.96. If you have a TH350 or TH400 probably 3.56. And you MAY have 4.10s ONLY if you have an SM318, SM326, SM330, T-89A, or T-150. But you most likely have a SM465 if it's a manual, they were trying to phase out the 3 speed by that point.
Educated guess- manual- 3.96, auto- 3.56
edit- some autos were equipped with 3.73- open your glove box and it'll prolly have a paper with a list of options taped on. that's if you can't find it stamped on the pinion or housing.
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