Differential Crown +pinion size 8 1/2 or 9-1/2 "

I will most likely have to take of the diff cover, there is not tag on the cover. I need to find out is the 3:08 an 8-1/2" or 9-1/2" crown and pinion. The rear end is a 10 bolt cover and the truck is a 1990
1/2 ton P.U. I am guessing the 8-1/2 is 1/2 ton 10 bolt and the 9-1/2 is the 12 bolt 3/4 ton
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it's a 10 bolt, 8.5", the 12 bolt 8.875" hasn't been used since the early eighties. the small 14 bolt (9.5") was only put in 2500's (except for the 454SS 1/2 ton).
hth, Bret

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