auburn limited slip carrier i.d.

I have what I believe is an 8.2 10 bolt BOP Auburn limited slip carrier. Is there any way to i.d. it and narrow down if it actually is a BOP carrier and what series gears will fit on it. I was told it definitely WON'T work in a Chevy.

Any help would be appreciated. Would like to get the Chevy 10 bolt out of my car and the original 66 Skylark 10 bolt open rear rebuilt with this carrier(I hope) and a good set of gears. I just need to know what range to look for.

If you need any more info, measurements, whatever, let me know...

1st pic is side view.
2nd pic shows casting # 11K7
3rd pic shows stamped # C8 27 10

 

No, I can't. The only other number's anywhere else on this thing is on the two plates that the springs are sandwiched in between and that # is 504014.

Also found U 2 B stamped on the housing between the word Patents and the US4612825 and Canada1987 patent numbers cast in the housing.

 

Appears to be a mid 80's Auburn built for GM according to this link.

http://www.oldspower.com/vb/showthread.php?t=25487

HTH

 

Hope that mine is not the 7.5 or the 7.625 carrier. Dumb question and I should know this but don't, What do I measure to determine if it is an 8.2??? Is it the ring gear bolt spacing???

Thanks...

 

Ok well measure through the center from bearing hub to bearing hub. pull the cross pin to do this.

Next check to see if the side spider gears ahve recessed area for c-clip .

looks like 7/16 ring gear hole correct?

now we need the ring gear flange diameter of the unit.

how many splines are the side gears 26 28 30 ???

 

Ok.

I won't be able to get exact dimensions until later in the week.

But going from memory, from bearing hub to bearing hub was somewhere between 7 1/4 - 7 1/2. I think. I will have to measure that again better later this week.

The side gears have a slight recess in them(deeper than a 1/16", but less than 1/8")

Ring gear bolt holes measured about .406, and the bolt circle measured 6.160. Those are exact, measured with dial calipers.

I did measure the outside diameter of the ring gear flange, but I don't remember what it was. I will get that dimension later this week.

Haven't counted the side gear splines recently, but I seem to remember there being 28 splines. But that is going completely from memory from a long time ago.

I will get more exact dimensions for you later this week. Don't have it with me at the moment, and don't have any way to get the numbers you need until then.

monzaz, I will check back here tomorrow night or if you could PM me your phone number, I could call you Tuesday to talk to you a little more about this. I'm on dial up right now, so this is REALLLLLLYYYYY SLOWWWWW to wait for the page to load.

Thanks...

 

OK. Looking at the carrier in hand now.

Overall length of carrier from bearing hub to bearing hub is about 7.445 measured with dial calipers thru the center.

The side gears have a slight recess in them, looks to be about 1/16".

Ring gear holes measure about 0.406"

Ring gear flange diameter is 7.410" using dial calipers.

Spline count of side gears is 28.

Let me know if you need any more info...I'm a machinist, so I have other measuring tools as well...

Thanks for your help.

Back on broadband now :beer

 

Ok well if it would be a BOP Auburn the ring gear holes will be 3/8 inch ON ALL of them NEW. BUT if some one drilled them out to fit the 1970 -1972 Pontiac gears then that would be why they have the 7/16 holes. The other thing it can be is a 8.5 which will have the 7/16 ring gear holes. BUT will be slightly wider than a 8.2.

CAn you also measure the ring gear flange hit from off the table to the machined surface where the ring gear and ring gear flange sandwich together? That will give us the exact thing it is mixed with all the other info. Jim

Use the picture to know what measurement I need and how to place it on the table. Jim

 

The flange height is right at 2".

The bolt holes measure a 1/32" over 3/8, which is about .406

7/16 would be .437

The holes don't look like they have been drilled out, but who knows. It does look like someone had a ring gear bolted up at one point.

The story I got was that the original person that owned it sold it on consignment through a local speed shop as an 8.2 10 bolt posi carrier. Someone bought it and tried to have it installed in a 8.2 10 bolt Chevy rear. Supposedly, when they went to install it, they couldn't get the axles in it properly. Don't know if they physically wouldn't go in to the side gears or they just couldn't get the c-clips in. But it was returned to the speed shop for a refund. It was then put back on consignment, with a note stating that it was thought to be a 8.2 10 bolt posi, BUT that it would definately NOT fit a Chevy 10 bolt, that it MIGHT be a BOP. And that if you bought it, you could NOT bring it back. All sales final. I took a chance and picked it up.


If this is in fact a BOP carrier that would fit my 66 Skylark 10 bolt rear, do you have gears available for it and what ratios and price? Also installation kits, and if needed, new axles, in case mine are fubar in some way. My 66 rear was making some kind of noise(clunk or popping) which is why I replaced it with the Chevy 10 bolt posi around 15 years ago.

If you do have gears for it, quote me a price on them with the installation kit w/shipping to 66109.

Thanks for your help and for reading my long-winded reply.

 

Jim will do...

Yes, it does seem as if this is the carrier you need for your. The last thing you need to check is the 2 side gears in where the pre load posi (limited slip)springs are in the cage. Look in there and see if you see a recessed cut to the side gear that will fit a c- clip in it ...the ledge will be about 1/16 - 3 3/32 " deep. perfectly round. If it does NOT it is BOP posi and is for 3.36 -4.33 and up gears

If it does have recessed side gears for the side gears and clip retention axles then you have a 10 bolt 8.2 CHEVY posi ...

NOW what is trigger my thought as it is a BOP unit...is that you said the guy returned it and said the axles did not fit. So if the axles did not fit HE had a chevy axle and was trying to fit it in a BOP carrier...BOP carriers and axles are 28 spline cut to 60 degree spline...Chevy axles are 28 spline c-clip and cut to a 45 degree spline cut and WILL NOT slide into a BOP carrier.

VISE VERSA- BOP axle will fit a chevy carrier BUILT a bit on the sloppy side for LOW horsepower use you can get away with it. Jim :3gears:

 

This just gets more interesting...My side gears look to have the recess(about 1/16") in them.

I may just have to unbury my 66 rearend from under all the junk I have stacked on it and pull an axle and see if it will fit this carrier.

I'm not against pulling this carrier apart if there is a BOP specific part inside that is a dead giveaway that this is not a Chevy carrier.

Let me know. Thanks for your help, Jim.

Gotta go. Will check in later...

 

Local repair shop has some spare axles. I will go Monday morning and find a c-clip axle and try to put it in the side gear.

Other thing I hadn't considered is maybe it really is a Chevy carrier and the guy who claimed he couldn't get the axles in maybe had the wrong axles(different spline count o No: ) Who knows?

Anyway, I will find out Monday morning.

 

If it was phyically in front of me I would have Ided it already...lol. JIm

 

It's seems that I have a Chevy 8.2 10 bolt carrier. Not what I was wanting.

I went to a local repair shop that had some spare used axles and I found a 28 spline c-clip axle and it just pretty much fell right in.

Jim, are the side gears the only difference between the Chevy and the BOP carriers? And if so, could I just swap in a set of the BOP side gears to make my carrier a BOP? Or is it more involved than that?

Could you PM me a phone number to call you and discuss my options in detail? Thanks...

 

That only shows that it is a GM c-clip 28 spline unit we still do not know if it is 7.5 8.2 or 8.5 ...all theys chevy rears came with 28 spline axles c-clip that is why I was asking for the ring gear bolt size...IF th ebolt size is 7/16 hole that would be 8.5 if it is a 3/8" ring gear hole then you have a 8.2 chevy

Yes it would probably be that simple as to swap Auburn side gear cones...BUT they do not sell them separately NO not all auburn units are the same from the past to now...TOTALLY different.

330 659 7117

 

Too late tonight to call??? Or would tomorrow be better? If so, when would a good time to call?