[Kenth]

Originally Posted by 72pontiac

what keeps the cones from bottoming. is it easy to check not sure if the seller can accommodate the breakdown

When the cones wear they dig deeper into the housing until they bottoms, loose function, and in worst case the small pinion gears brake due to too large distance to the side gears.

For a new Auburn 2.93-3.23 posi check with:

https://tomsdifferentials.com/2011ca...talog_Dec5.pdf

FYI, LSD additive is used to reduce wear and noise in cone style posi.

[Baron Von Zeppelin]

There didn't use to be many who could/would properly machine-rebuild the cone posi units.
Probably even fewer now.

If I didn't have the direct means to verify the used unit as even being a posi chunk, correct series carrier, and cones in nice shape .... I would bypass the $225 mystery , and spend $400 for a brand new one.

If you could verify everything was correct application, then find the cones are worn, your total investment will be much more than $400 to get it back in business.

Parts like this , you need to be well versed or have a well versed friend along when buying used.
I don't consider myself well versed at all on differentials.
Wouldn't gamble over $100 on it unless I had the abilities to verify all things.

[72pontiac]

Originally Posted by Baron Von Zeppelin

There didn't use to be many who could/would properly machine-rebuild the cone posi units.
Probably even fewer now.

If I didn't have the direct means to verify the used unit as even being a posi chunk, correct series carrier, and cones in nice shape .... I would bypass the $225 mystery , and spend $400 for a brand new one.

If you could verify everything was correct application, then find the cones are worn, your total investment will be much more than $400 to get it back in business.

Parts like this , you need to be well versed or have a well versed friend along when buying used.
I don't consider myself well versed at all on differentials.
Wouldn't gamble over $100 on it unless I had the abilities to verify all things.

Can you point me to a unit thats available for $400 that will accept my 3:23 ring and pinion. Better yet I'll stick with the open.

[Baron Von Zeppelin]

The Auburn that Kenth posted a picture and linked to in post #21 says it is $395.70
for 2.93 - 3.23 ratios

[72pontiac]

No longer available

[72pontiac]

Guess I'm stuck with a one wheel squeel
I told the guy no. You all talked me out of it.
It was either good or it was bad we'll never know

[Geoff]

No, not stuck with it.
As I said earlier, you can use the PowerTrax NoSlip, almost unbreakable.

They fit the non-posi centre, does not disturb the ring & pinion, can be done without removing the assy from the car, done in 45 min.

[PONTIAC LARRY]

Originally Posted by 72pontiac

Guess I'm stuck with a one wheel squeel
I told the guy no. You all talked me out of it.
It was either good or it was bad we'll never know

Just build a normal Corporate 8.5 from a 71-72 Skylark/Cutlass and open the door to endless new and used parts readily available.

[1_Wild_Cat]

So what is the option for someone with a factory 3.23 posi (‘64) who wants to keep their original differential?

[72pontiac]

Originally Posted by 1_Wild_Cat

So what is the option for someone with a factory 3.23 posi (‘64) who wants to keep their original differential?

I guess buy used posi like I was going to
Or that thing mentioned in the #27 post
Or a spool or keep an open rear end

I've seen them from $500-$900 asking I thought $225 was a steal. But I was told out to it. If it was no good I would have eaten $225 and stayed open or spent equal to or more on another option

[72pontiac]

The guy said he bought it as a good working unit. He will let me take it and have it checked out. What you all think about it, based on that.

[geeteeohguy]

Originally Posted by 1_Wild_Cat

So what is the option for someone with a factory 3.23 posi (‘64) who wants to keep their original differential?

My choice was to drive the car without abusing the crap out of it anymore. I bought the car in 1982, toasted the rear end in 1990 (ran it out of oil) and had Larry Woltzen rebuild it. It's been perfect for the last 32 years, with me cutting down on the burn-outs and power-shifts. There are folks that can rebuild the factory cone clutch posi units.

[AG]

Originally Posted by 72pontiac

The guy said he bought it as a good working unit. He will let me take it and have it checked out. What you all think about it, based on that.

Take it apart in front of him and check if the end of the cones are bottoming out on the case, you will know what I mean. Here's a pic of a cone just starting to bottom out in the case. When this happens, the case and cone faces need to be machined and then you need to shim between the side gears and cones to get the proper backlash. I've done a couple and they will last awhile but I would not do it again. Isn't an Auburn available?

[Baron Von Zeppelin]

Originally Posted by 72pontiac

The guy said he bought it as a good working unit. He will let me take it and have it checked out. What you all think about it, based on that.

That is as fair a deal as you can ask for, and I would do that.
As in I would physically have it apart and inspected.

Question still remains - how to verify it is a Series 2.
If can't verify until you have yours apart to compare, at least you would know at that time you had a verified good used Series 1 or Series 3 you could put up for resale.

Somewhere on this site there has been at least one good thread about differences and distinguishing between 8.2 posi chunks. Series ID'ing and the difference of bolt hole sizes / thread orientation.
But it might take a whole lot of creative searches to find it again - if even.
Maybe it was in Street Section , but I can't remember.

Monzaz was probably involved with it some, if you searched his post archive history you might find one or two discussions that could help.
64-65 section is pretty slim on activity, the whole forum itself is much slimmer these days.

['ol Pinion head]

Originally Posted by 72pontiac

The guy said he bought it as a good working unit. He will let me take it and have it checked out. What you all think about it, based on that.

First, I'd check & make sure that the exact same size carrier bearing is on each end of the cone type carrier. LATE BUICK 8.2 (or BUICK 8.25 whatever they're being called today ) rears were used from '68-70 in Buicks, and they were assembled with cone type posi carriers in 4 different ratio's. The driver's side carrier bearing on these is larger diameter, it's the same carrier bearing as used in a 12 bolt. A Buick guy needing one of these posi carrier is better off with one of these.

If both carrier bearings are the same size, then the cone style posi carrier originated in a Pontiac 8.2 rear or in an early Buick 8.2 10 bolt rear. To identify which of the three different ratios this carrier could be, set the carrier its drivers side end on a flat table & measure up from the table to the top of the machined flange where the ring gear is bolted to.

Will do some more looking in the shop, know I have a low ratio 4 pinion Pontiac 8.2 carrier to measure off of, just was not in the tub ps with other used posi carriers. Have been conserving my energy this week fighting off the Omi headaches & sniffles

[72pontiac]

Originally Posted by 'ol Pinion head

First, I'd check & make sure that the exact same size carrier bearing is on each end of the cone type carrier. LATE BUICK 8.2 or BUICK 8.25 whatever rears were used from '68-70 and they were assembled with Cone type posi carriers in 4 different ratio's. The driver's side carrier bearing is larger diameter, it's the same as used in a 12 bolt. A Buick guy needing one of these is better off with one of these.

If both carrier bearings are the same size, then the cone style posi carrier originated in a Pontiac 8.2 rear or in an early Buick 8.2 10 bolt rear. To identify which of the three different ratios this carrier could be, set the carrier its drivers side end on a flat table & measure up from the table to the top of the machined flange where the ring gear is bolted to. Will do some more looking in the shop, know I have a low ratio 4 pinion Pontiac 8.2 carrier to measure off of, just was not in the tub ps with other used posi carriers.

Would the measurements be the same as the open I assume.
He states it is out of a 65 gto
I would like to get it and use it as is that fits my budget
Did you see that he said I could have it checked out before I buy that helps a lot right
Here's a picture
Oh boy feel better. Im getting sick hoping it's not you know what
I search a long time for my 65 axle housing don't want to go to a 8.5 also would like to keep my 3:23's

['ol Pinion head]

Yes, the dimension will the same with same series open carrier. Have the '69 3.23 STT rear out of my '69 428HO GP, I'll pull the carrier tomorrow AM & take a measurement.

This measurement is something I've noted on PY before, going to do a quick search, if can find the thread, will save some moving of rearends in the AM

['ol Pinion head]

Found my previous post, was helping a member from the Netherlands adapt a '68-70 Buick 8.2 posi carrier into his Pontiac 8.2 center housing.

"In measuring a low ratio (3.36-4.33) 8.2 Pontiac carrier, standing on its driver's side end, I'm coming up with aprox 2.050" from the counter top surface to the plane where the ring gear mounts. A mid ratio 8.2 Pontiac carrier (2.93-3.08-3.23) is basically going to measure .200 of an inch less, so aprox 1.8050". If you can measure your Buick carrier, even if it's in mm, we can do the math & then figure whether it is even viable to use the Buick 8.2 carrier in the Pontiac 8.2 housing."

[This message was edited by ol' Pinion head on November 16, 2003 at 10:27 AM.]

Upon receiving the cone type carrier, just need to measure it, the measurement should be very close to 1.80".

[72pontiac]

Originally Posted by 'ol Pinion head

Found my previous post, was helping a member from the Netherlands adapt a '68-70 Buick 8.2 posi carrier into his Pontiac 8.2 center housing.

"In measuring a low ratio (3.36-4.33) 8.2 Pontiac carrier, standing on its driver's side end, I'm coming up with aprox 2.050" from the counter top surface to the plane where the ring gear mounts. A mid ratio 8.2 Pontiac carrier (2.93-3.08-3.23) is basically going to measure .200 of an inch less, so aprox 1.8050". If you can measure your Buick carrier, even if it's in mm, we can do the math & then figure whether it is even viable to use the Buick 8.2 carrier in the Pontiac 8.2 housing."

[This message was edited by ol' Pinion head on November 16, 2003 at 10:27 AM.]

Upon receiving the cone type carrier, just need to measure it, the measurement should be very close to 1.80".

Buick? 65 gto

['ol Pinion head]

Relaying to you the measurements for a mid ratio & low ratio Pontiac 8.2 carrier.