8.5 posi differentials. What are you using?

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8.5 posi differentials. What are you using?

Post by bracketchev1221 on Tue Oct 15, 2013 8:55 pm

What types of differentials are you using? Is any better than others. Back when I had my last street car the Auburn was the hot one, but it seems they have lost a following. I think they cannot be rebuilt. My Nova has a stock GM/Eaton that was rebuilt before I got the car. Is there any specific cars I can look for an Eaton to rebuild? Or is there something else? I have no experience with lockers or Tru Tracs, and not sure if this car really needs a ratcheting noisy rear. Thanks.
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Re: 8.5 posi differentials. What are you using?

Post by Joe73 on Tue Oct 15, 2013 8:58 pm

I've installed a couple of Auburns in my 4x4 trucks. They have been great. I'd recommend them again.
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Re: 8.5 posi differentials. What are you using?

Post by dynchel on Tue Oct 15, 2013 9:26 pm

I have a Richmond powertrax locker. It works very well, and was a very straight foward installation. That said it is a bit noisey, not real bad but on slow turns (like backing out of driveways) you can definatly hear it.
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Re: 8.5 posi differentials. What are you using?

Post by LSANTI76 on Tue Oct 15, 2013 10:47 pm

I've ran an Auburn w/3.42s for the past 13 yrs with street tires without any problems. If I were going to the track more & running slicks I would look more towards an Eaton. From what I've heard Eaton is worth the extra dollars & plus you can rebuild it if needed.
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Re: 8.5 posi differentials. What are you using?

Post by bracketchev1221 on Tue Oct 15, 2013 11:07 pm

LSANTI76 wrote:I've ran an Auburn w/3.42s for the past 13 yrs with street tires without any problems. If I were going to the track more & running slicks I would look more towards an Eaton. From what I've heard Eaton is worth the extra dollars & plus you can rebuild it if needed.
This is what I had thought. I know we ran an Auburn in my friend's 12 bolt and it took quite a bit of abuse. I think we wound up going 11.70's with it with the 4 speed before it went. But I don't know what he put in after it broke. It's only money!!!!
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Re: 8.5 posi differentials. What are you using?

Post by Joe73 on Wed Oct 16, 2013 5:52 am

I believe Auburn has two lines of units. One is considered their high performance model.
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Re: 8.5 posi differentials. What are you using?

Post by bracketchev1221 on Wed Oct 16, 2013 5:41 pm

I did see that, and their hi performance one is the same price as the Eaton. That makes it a toss up I guess. The lower grade one is $100 less. This is where I get stuck. $100 looks great for a savings now, but down the road I always look back and say, but it was just $100. Why didn't I get the better one?
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Re: 8.5 posi differentials. What are you using?

Post by 74Malibu383 on Fri Oct 18, 2013 11:58 am

I've blown up 3 Auburn units in the Chevelle. Went with an Eaton with the strongest springs they make in 2009 and haven't had a problem since.
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Re: 8.5 posi differentials. What are you using?

Post by bracketchev1221 on Sat Oct 19, 2013 3:08 am

I think I am going to go for the Eaton. Now the next choice. Upgrade the axles or not. The car is heavy. But its only got to get into the 12's. Decisions Decisions.
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Re: 8.5 posi differentials. What are you using?

Post by ant7377 on Sat Oct 19, 2013 8:06 am

Ive got one of each. Both seem to work well but Im not pushing the much HP but neither are noisey.
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Re: 8.5 posi differentials. What are you using?

Post by 74Malibu383 on Mon Oct 21, 2013 11:18 am

I had stock axels up until this year. I didn't have a problem with them, but I wasn't doing much drag racing, and never did get the car to hook on slicks. If you're going to have it all apart, it's probably a good idea to replace them while you're at it. I went with Moser.
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Re: 8.5 posi differentials. What are you using?

Post by bracketchev1221 on Mon Oct 21, 2013 11:35 pm

I like Moser too. I have 33 spline Moser axles in the Chevelle.
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Re: 8.5 posi differentials. What are you using?

Post by bracketchev1221 on Wed Mar 12, 2014 8:40 am

I was looking into the rear end parts for the malibu, and was pleasantly surprised to find that Moser makes both a 28 and a 30 spline C-clip axle as a direct replacement for these cars. Considering that the 28 and 30 spline Eaton differentials are the same price, it is well worth it to me to spend $260 I think it was for a set of new axles. I will most definitely go for the 30 spline.
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Re: 8.5 posi differentials. What are you using?

Post by 74Malibu383 on Wed Mar 12, 2014 12:00 pm

Might want to look into one of those TA Performance Girdle Support covers too. I put one on a while ago and so far so good. I've never fully hooked up, but I do know I've put 590HP to the tires and the rear end is still in one piece.
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Re: 8.5 posi differentials. What are you using?

Post by bracketchev1221 on Wed Mar 12, 2014 12:33 pm

That is a possiblility. I have the LPW cover in the Chevelle along with the Strange Billet caps.
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Re: 8.5 posi differentials. What are you using?

Post by oldstofty on Wed Mar 12, 2014 12:39 pm

Ray I have the Cover with support bars on my car, and moser axles.
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Re: 8.5 posi differentials. What are you using?

Post by 74Malibu383 on Wed Mar 12, 2014 1:44 pm

Ah... Ok. Same deal then. Any particular reason you went with Strange caps? Did your stock ones fail?
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Re: 8.5 posi differentials. What are you using?

Post by bracketchev1221 on Wed Mar 12, 2014 2:00 pm

oldstofty wrote:Ray I have the Cover with support bars on my car, and moser axles.

74Malibu383 wrote:Ah... Ok. Same deal then. Any particular reason you went with Strange caps? Did your stock ones fail?

Short story is, the caps were put in when I first put the rear together and the car was going 11.20's at 3675 lbs. I ran a stock cover. The girdle was put on when I tried to run ladder bars while keeping the stock springs and shocks. The girdle was more for housing support because I felt the rear was unsupported outboard of the ladder bars. So I used the LPW cover with the brace tubes to the outer ends of the housing. This kept the housing from flexing forward. I think it went 10.30's with low 1.40 60' times. Then I decided to keep the ladder bars and narrow the rear end. The cover was already in place, so I kept it figuring the 12 bolt needed all the help it could get to stay together. So since then the car weighs 3170 with me in it, has gone 1.26 in 60' and the motor made 910hp/776 tq. And the 12 bolt is SO FAR still together. Very Happy 
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Re: 8.5 posi differentials. What are you using?

Post by driveit on Wed Mar 12, 2014 2:27 pm

Wow...910hp/776 tq. I think I would probably need to go home and change clothes after a run in that thing. I probably have not even hit 250 hp.
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Re: 8.5 posi differentials. What are you using?

Post by bracketchev1221 on Wed Mar 12, 2014 2:32 pm

And it all started as a street/strip 70 chevelle on 10" slicks. I went a best of 11.05 with a 540hp 427 back in 1996. Now too much money later, it's gone 9.03 with the 540 in it. The goal for the malibu is to be a TRUE street car, and go 12.99. That is it!!!!!
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Re: 8.5 posi differentials. What are you using?

Post by thatfnthing on Wed Mar 12, 2014 2:36 pm

bracketchev1221 wrote:The goal for the malibu is to be a TRUE street car, and go 12.99.  That is it!!!!!

You say that like there's an end in sight. Smile
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Re: 8.5 posi differentials. What are you using?

Post by bracketchev1221 on Wed Mar 12, 2014 2:40 pm

thatfnthing wrote:
bracketchev1221 wrote:The goal for the malibu is to be a TRUE street car, and go 12.99.  That is it!!!!!

You say that like there's an end in sight. Smile

There better be.  My wife said so!!!! Laughing

But the Nova has to sell first before I can REALLY get into the Malibu.

P.S. She said that too.
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Re: 8.5 posi differentials. What are you using?

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