GM rear gears

[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 ......

[PxTx]

Yep, I've seen that Hugger. Where did you move to?

My other sister's 69 Camaro was right at DaddyPops in the 1999 show. It is Midnight Blue with the white stripes (down the smoothed firewall) and has a X-ram in the trunk. Anyways it's amazing we've never talked before. Do you know Mike Clark or Andy Good? I spent a summer during college working next to them. I was working at Shawn Ferrel's "The Vette Shop".

As for the 4.33 gears, Casey's answer is makes perfect sense, although I do find it slightly ironic that both the housing and the ring and pinion have are for 1970 applications. The date code on the housing is before the ring and pinion, for whatever that is worth.

I counted the ring gear teeth and there are 39 of 'em. Since she (my sister who is building the B-M Nova clone) has the 4.33 gear, I think that is what she'll run. After all some comprimises have to be made due to her budget.

Thanks for all of the input guys!

Paul Tholey

[YENKO DEUCE REGISTRY]

Paul;
The HO Y-Camaro is a second owner car, he bought it from a used car lot in December of '69 in Flourtown. Car was orig. from Marshall Chev. in Reading, PA, and is a 4speed with p/s and v/t. The owner has some really cool photos of him racing it at Maple Grove in the '70's.

I have never been to the Vette shop, but have heard about for years. I moved to Douglassville, (out by Collegeville), and am now closer to Maple Grove, the HO Yenko and a Lemans Blue Yenko Camaro in Phoenixville that is also a second owner car believed to have been purchased off of the same used car lot in Flourtown in 1970!
M

[Kurt S]

That axle could also be from a 69 Camaro. They started coding the 3 letter rearend codes in 1970 model year and many of the late 69 Camaros got it.
I believe that gear was available over the counter and the dating kinda confirms that. Several unusual ratios were sold over the counter and never in a production vehicle.

Kurt

[PxTx]

Marlin,

Are you familiar with Coupe Chevrolet? My father started working there in 1970. What was the name of the used car lot that sold the HO Y-Camaro?

As for the OTC gears, I have found a set of GM OTC 4:11 gears for a 3-series carrier dated 1968 (I think).

So the choice now for the clone is which gears to run in the Nova? Anyone know about B-M camshaft options?