Thread: Posi??

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I'm lookin for a new rear end because I'm getting kind of tired of only leaving a single burn out mark. Any suggestions as to what route to go for 383 w/TH350?

Originally Posted by Damien_63

I'm lookin for a new rear end because I'm getting kind of tired of only leaving a single burn out mark. Any suggestions as to what route to go for 383 w/TH350?

as tech always say, add an air shock to the r/rear and add a little air to it, makes the best, cheapest posi you ever seen.

9" Fords are still the best, shouldn't be too tough finding one the right width for your pickup. Got one out of a Lincoln that has disc brakes on it, 63" from wheel mounting flange to wheel mounting flange

What gears do you recommend? And the 9's are posi?

use a 12 bolt beefed chevy rearend. or an early olds rearend. or find a dana 60

Originally Posted by Damien_63

I'm lookin for a new rear end because I'm getting kind of tired of only leaving a single burn out mark. Any suggestions as to what route to go for 383 w/TH350?

I'm surprised that the rear end is still together, I tore 3 of them up when I had the 400 in my '62.

Damien,
"posi" or pisitraction is a General Motors term for a clutch type limited slip. Other car companies use different names for the same principle. In addition to clutch type limited slips, there are also designs that do not use clutches; they use ratchets or some gear form instead. However, all get lumped into the "posi" bucket.

When you ask if a particular rear end is a posi, the answer is maybe yes and maybe no. There is no axle type that is always either a limited slip or not a limited slip......limited slip was and is an option. Therefore, just because you buy a 9-inch Ford axle, you dont know if it is or is not until you check it.

"posi" or limited slips use the same ring and pinion as does a non-posi axle...a non posi axle is referred to as an "open" rear end. The carrier is the part that the ring gear bolts to....it is different for a posi. If you have an open rear end, you can change it to a posi by replacing the carrier and setting the mesh on the ring and pinion.....or you can have it done by a compentent mechanic.

The addition of a posi does not make the rear axle stronger.

hope this helps you understand

mike in tucson

Originally Posted by gassersrule_196

use a 12 bolt beefed chevy rearend. or an early olds rearend. or find a dana 60

i'm soon to be needing a "posi" you piqued my interest when you mentiomned early olds as having that rear end. what early years are we talking about? my donor is a 1979 cruiser wagon, converted from deisel to gas