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Re: 83 12 Bolt Posi in a 72?
I didn't think 12-bolts were available in trucks newer than 1972. Later 1/2 ton trucks used the 8.5" 10-bolt as standard.
Well, I see that Rock Auto sells several parts and kits for 1973 8.875" diffs (12-bolt I assume), so it must have been standard on trucks with higher GVWR.
Your biggest issue, IMO, is the type of springs used -- leaf or coil.
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Mike
1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold
1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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