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Re: which posi unit to get?
This may confuse you even more but....I installed an Auburn posi in a 72 12 bolt with 3.73's about 8 years ago. Promptly punished it repeatedly...I mean punished it...our dragstrip has Friday night fun drags (which I drove it to from the house 70 mile round trip). I passed the truck off to all my buddies several weekends in a row so they could share the fun... and literally never turned the ignition off while at the strip. They will let you come right back to the staging lanes from the return road. We played with the timing and carb all night and basically hott lapped the track. The auburn has never popped, cracked, or left anything other than two 10 inch wide equal length black stripes behind it (from hoosier q/t dot slicks). I think it's great (at close to 400hp anyway)..just my .02 worth.
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