GM rear gears

[Casey Marks]

Boyz - I am wwwaaaaayyyy outta my league here, but ........

Olds did offer a 4.33 gear set for their "O" axle. This is obviously not the same as a typical Chev 12-bolt or a B-P axle. It is it's own animal and uses it's own internals.

px - do you know if this ring and pinion was in your existing carrier ? If not, it very well could be an Olds unit, ...........

I have a 4.33 Olds R&P stashed away, and will check the numbers on it to see if they match up to what you've got.

[JoeC]

Pontiac also used some gear ratios that were inbetween the Chevy ratios.

[PxTx]

I received this rear with the housing freshly blasted and painted. All of the internals were included in a box. I'll be assembling the rear soon.

The carrier is a 4 series unit, which is one of the indicators leaving me to beleive that this combination was original. Most people who went from a 3 series gear to a 4 series used a spacer plate, very few spent the extra money for a new 4 series posi unit.

I am pretty sure that a BOP ring gear will not bolt onto a Chevy 12 bolt carrier, the 4.33 I have does.


Cheers,

Paul Tholey

[Casey Marks]

Are you sure that the 4-series posi and related gear are in fact Chevy guts ? As JoeC suggests, BOP had ratios typically in between the Chev's. I don't *believe* that Buick had a 4.33, but Olds and Pontiac did. They may be Olds or Pontiac guts that you got in a box with the Chevy housing ?? Justa thought - especially if you never had the whole thing put together as an assembly.

[PxTx]

The carrier casting numbers check out as a 4 series Chevy 12 bolt posi. I'm not sure how to determine the date of manufacturing thought.

[YENKO DEUCE REGISTRY]

px;
Been to all of the Hatboro shows, lived in Hatboro for 8 years till last Sept. If you've been to that show, then you must have seen the Huggar Orange '69 Yenko Camaro that was there - usually at the end by DaddyPops.

If your R&P is a chevy unit, and you're sure about the 39, count the teeth to make sure it is not mis-stamp.
M

[Casey Marks]

DUH !!! Casey .....

After thinking about it - I'm convinced it was originally in a Pontiac application. The Chev and Pontiacs both had *12-bolts*, as most know them, but the Olds is a *pseudo-12-bolt* in that it has a 12-bolt cover with a 10-bolt ring gear.

That's my final answer ......