I'm the 3rd owner (one owner was my brother) of a 72' Malibu.

The car originally had a 307 with a powerglide in it.

I've since put a 454 and a th350 in it.

I recently got into the rear. It's a one-legger 8.2 inch 10 bolt. pretty much junk.

My question is, what gear did they originally come in? I divided the number of teeth on the ring gear by the number of teeth on the pinion gear and it's a 3.08 gear, which seemed a bit odd to me. I thought they had 2.73 or a 2.5? in them stock.

Input???

As far as I know, nobody ever put a gear in it.

thanks.

3.08 was a very common gear in any chevy product, 10 or 12 bolt. less common was 3.36 in the 10 bolt and even more scarce was 3.70 8.2 used with O/D applications. tom

I'm the 3rd owner (one owner was my brother) of a 72' Malibu.

The car originally had a 307 with a powerglide in it.

I've since put a 454 and a th350 in it.

I recently got into the rear. It's a one-legger 8.2 inch 10 bolt. pretty much junk.

My question is, what gear did they originally come in? I divided the number of teeth on the ring gear by the number of teeth on the pinion gear and it's a 3.08 gear, which seemed a bit odd to me. I thought they had 2.73 or a 2.5? in them stock.

Input???

As far as I know, nobody ever put a gear in it.

thanks.

That sounds EXTREMELY LIKELY that it came with that gear. As already mentioned, the 3.08 10bolts were VERY common back then.
If you beat and bang on it a lot, you need to start searching for a 12bolt posi. If you CANNOT locate a 12bolt with a posi, you can buy a new Eaton posi unit (that's what came in them) and install it. If you are going to be driving it in a sane manner, and the 3.08 is in good shape, then you could buy an Eaton for the 10bolt and install it. Doing nothing except adding a posi to a non-posi rear will definitely increase its life expectancy. :thumbsup: