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Re: 83 12 Bolt Posi in a 72?
Quote:
Originally Posted by Ironangel
The test for a posi is done when the diff is fully assembled and the axles and wheels are on. Jack up one side and measure the torque it takes to release that wheel...I'd just look it over good, make sure no discs are missing or broken. Check the springs and plates for breaks or cracks. Use a pair of Channel Lock pliars to compress the spring plates...
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That's a good way to do it. The only posi I ever tore into was a Ford Trac-Lok. And the final test was the work bench version of just what you said about measuring torque. I've been waiting 4 years to see my work in action. It's for a friend's 56 Chevy car that is turning out to be a perpetual project car!
My truck's 12-bolt has an Auburn cone-type diff that I installed over 20 years ago. It still lays down two strips of rubber, and doesn't chatter in turns, but doesn't really get much abuse.
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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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