My stock 323 posi only seems to be only leaving a single tire mark. Can this stock unit be rebuilt? Should i go buy a new auburn?

 

depends of the damage and parts that are worn if your posi can be rebuilt, or rebuilt in a cost effective mannor. you'd need to take it apart and have a look to know what you need.

 

Agreed. They can be rebuilt fairly inexpensively as long as no expensive hard parts are damaged. If all it needs is new clutches and floaters then it's really cheap. Keep an eye out for damaged springs though, as this isn't uncommon, especially with hard use.

 

What they both said....

And there's always the possibility that it isn't a posi in the first place, no matter what the "codes" or the "2 stripes" or other similarly unreliable methods may have lead you to believe at some time in the past.

Auburn sells all of the parts to rebuild it, if it's a posi, because they probably made it. If it's a posi but not an Auburn, specifically if it's an Eaton Gov-Lock, throw it away and get a different one instead of throwing money away on it. If it's not a posi at all, I'll leave it up to you to figure out what to do.

 

definately a posi. jacked up car cant hold back in drive. limited slip tag on cover. who sells them rebuild kits? how will i know if its a auburn?came out of87 firebird 10 bolt .if possible post picture of it

 

I don't know about "hold back"... never heard that one... but I know quite a few people that had the tag but no posi.

I'd sure crack it open and look at it before I ordered anything; especially since about 99.99% of all 87 Firebirds with anything making even the weakest claim to a performance setup, didn't get a 10-bolt, they got a 9-bolt.

www.auburngear.com/aftermarket

Here's a stock GM posi made by Auburn.

 

on open rear end at idle you can hold one wheel in drive and the other will spin. both wheels on mine are locked.also when jacked up spin 1 wheel one way the other will spin opposite. it is a 1987 firebird 10 bolt posi.

 

I must have that 1/100th of a %323 10 bolt posi 1987 firebird

 

9 bolts are rare. mine is a 10 bolt drum posi rear

 

9-bolts are extremely common in 85-89 Trans Ams. Virtually all TPI ones got them. I'd say "all", but somebody would probably post about how they have the "rare" special-ordered one without it. 10-bolts were only used as std eqpt in the LG4 and L03 (low-perf bottom-of-the-line) ones.

 

well mine is a rare 323 10 bolt posi drum rear. borg warner 9 bolts are rare.

 

OK you win. Whatever. That must be why so many people on this board have them, and why about half of the rear end questions in this forum concern 9-bolts.

Are you sure yet that yours is a posi? Apart from "codes", "2 stripes", "hold back" (whatever that is), etc. etc. etc.? That is, have you taken off the cover and looked and compared it to my pic yet? Seems to me like rather than arguing some erroneous point about what's "rare" or not, it would be a good idea to go find out what you've really got, before jumping to conclusions, especially since your car would about have to be a LG4 or L03 car to have that rear, not a higher-perf one.

It might save you some time money and grief to make sure of what you have before ordering parts to fit some other version of thse cars besides what yours is.

 

i wont argue its no lg4 its tuned port. there are a few people on here with 9 bolts. they are priviliged. i know what i have thanks for the picture.they are rare and hard to find.

 

Sorry to sorta hijack the thread here but now I'm confused. The picture RB showed is an auburn unit? I was under the impression that the auburn units were the cone clutch syle posi, and it's not rebuildable. I have a 28 spline ten bolt posi in my car out of a 91 GTA. And yes, I know for a fact that it's posi since I've had the cover off. I was under the impression that the units with clutches and springs in the center were made by eaton? Could someone tell me if it's actually and eaton or an auburn?

 

Here's another pic of it.... don't think there's too much doubt as to who made this one....

It's suposedly out of a 91 or 92 GTA. I bought the rear and worked it up somewhat, and have no use for a stock posi in it. I have an Eaton in there now.

 

So the stock unit in my 91 rear is an auburn then?

 

Likely so....

I've never seen an Eaton posi in one of these, except for the Gov-Lock (which doesn't really count in my book).

I guess if you're ever changing your fluid, you could make a point of looking at the end of the carrier, and see if it has that giant Auburn logo forged into it. I'd be inclined to think it will. They do have a cone type of clutch though, as opposed to some of the others that have flat plates.

As far as "rebuildable", click on the Auburn Gear link I provided; surf around their site; you can find part #s, instructions, etc. They've got a 5-page PDF on there somewhere that I keep on my hard drive.

 

9 bolts only seem rare when you goto buy one......


they arnt tossed aside as much...


i know several people who have their stock 9 bolt.


i dont personally know anyone that put a 9bolt in...

 

just asking but on an non posi rear when you have both wheels off the ground one wheel will spin 1 way the other will spin the other way.right or wrong?

 

Yes, if the trans is in park, or in gear if it's a manual.

 

yep if its posi they spin the same way

 

.

 

Rare? If you want one, let me know. I found four with no difficulty (though one may have already been sold to AndyZ28), and ALL had PBR's. I've seen two of the four: one was missing part of the e-brake cable mechanism on the pass side, the other was complete--darn thing was in such good shape that the axel tubes still had paint on them!

I wanted the 89-92 ten-bolt--now that's rare, if there is one! I guess I'll go with the LT1.

By the way, Josh, one of the 9-bolts with PBR's (3.27's) I saw for myself is supposed to be from a 90 car.

Should anyone be interested in the 9-bolts, please PM me.

JamesC

 

Ok, now I got your info sorted out! I knew there had to be a significant, tell-tale mark somewhere on that carrier in the pic you posted! I had no idea what marking identifies an auburn unit so I was at a loss figuring out what you were trying to show me in that pic. I'll agree with you that the Gov-Lock deserves no recognition. Heard nothing but bad things and stories of broken ones when it comes to those things. There's guys all over ebay trying to sucker people into buying them as a "great posi unit". Who knows when I'll have the rear cover off again, but the next time I do, I'll have to look at the marks on the carrier housing. Thanks for all the helpful tips RB!

 

The Auburn Gear logo.....

Logos are good for something, after all.

 

The 9-bolt rear is weird to me because all the F-bodys around here are 10-bolts. 87 Formula 305 4bbl, 91 Formula 305 TPI, and a 89 GTA. The only one I know of that has a 9-bolt is my friends 87 GTA which has rear disc. I have a 89 Trans Am with a 10-bolt 3.08 posi drum. What does the Eaton Guv-Loc look like, anyone have a picture. Last time I saw my diff it looked like it had a sideways S. Just had my rear end rebuilt couple hundred miles ago with a new gear, bearings, and he replaced (washers?) in the posi. The thing always does posi going straight or turning left, but if you have the wheel turned to the right at all the thing will do a massive one wheel. (right side obviously) The kid with the 87 GTA 9-bolt bought his car about 3 years ago from a dealership and they told him it had a bran new 3.73 gear and a Auburn posi. This kid beats the crap out of this car and he can sit still and turn the wheel all the way to the right then punch it and it will do posi completely. That really pisses me off. Did he have a new stock Auburn? Sorry for making such a stupid reply.