I will soon be upgrading to a 12-bolt rear end for my '71 Chevelle. North of it will be the upcoming Muncie 5-speed and a fairly strong street 454. I will be putting 4.10 gears in it.

The car will mainly be driven on street, on highway, anywhere, you name it: it's my daily driver. It may see the track 6 or so weekends in the summer if it's lucky.

I don't want to spend a lot for an uber-performance one but want it to do what it should, but be fairly quiet on the street driving and turning, and SAFE (so no mini-spools or anything).

I'll be using stock axles just to make it drivable until the summer when I get a bit more money and may get new axles (depending on the condition of the ones I get).

Thanks for any help...maybe BGH will chime in up here...if not I may post in transmission forum later..thanks!

EATON 1.55 60ft's with an Eaton posi

another vote for the eaton

Eaton! Love it like nobody's business. My 12 bolt has an Eaton in it I could not be happier. Never slicked it, but it doesn't care about 265 T/As and CalTracs.

Eaton.

Eaton, 295/50 BF T/As, they always spin equally :D

Is an OEM GM Eaton w/ new clutches reliable in say a 425HP street car (not that I have one, lol) ?

Thinking of grabbing one at the pick-a-part on half off day.

eaton can be rebuilt auburn cant.going with a 5 speed???you'd be happier with something around
3:23's for gear for daily driver and 5 speed
your bb would be wound up all the time.
shane

Has anyone tried a powertrax system or a Detroit Truetrac?

Originally posted by Slowpoke70:
Is an OEM GM Eaton w/ new clutches reliable in say a 425HP street car (not that I have one, lol) ?

Thinking of grabbing one at the pick-a-part on half off day. I use an Eaton posi (400lbs springs) in my ride. 60' times in signature. I've got ~5,000 street miles and 340 passes on this posi unit with no failures.

I have a Powertrax no-slip in my car.
Has worked well for almost 10K miles,and I bought it used.

Powertrax, just finished the 5th season with it.

But it is Noisy, go with the Eaton based on your requirements and I agree with the rear gear recommendation. 3.42 is what is available in the aftermarket, 3.23 and 3.31 GM gears can be found too.

New Eaton c/w carbon fiber clutches. a bit growly around sharp turns sometimes but I really like the unit.

The Muncie 5-speed will have an OD, so with 4.10s and the OD (think it was .68), the rear will be like a 3.08, so I think I'll be OK there.

Eaton sounds like a pretty good deal then..no wonder I've heard of it so much. Thanks guys.

Not to tread on the the thread but what's the general opinion of a Moroso Brute Strength unit?

Originally posted by Purs:
Not to tread on the the thread but what's the general opinion of a Moroso Brute Strength unit? The Moroso Brute Strength is the Eaton with additional clutches and heavier springs...Moroso merely re-packages the Eaton and marks it up.

have a powertrax locker in my 10 bolt , works great and the noise is not too bad, i rarely even notice any more