I have a 97 SS with discs and an aftermarket 4.10 posi. Ring gear missing 2 teeth and pinion missing 1 tooth. Differential appears to be fine, posi still tight. So essentially, I think ring/pinion gears and bearings would fix it back up well.

However, being an aftermarket posi unit, (and gears for that matter) that were in the car when I bought it (so I didn't buy or install these parts) I have no idea what they are. There is a part number cast into the differential that I'll try to find, but otherwise the ring gear does not have any identification on it.

In a previous life as poor white trash, I blew up lots of 7.5" rear ends. I found that (even though I know many of you will tell me this won't work) I could quickly swap in another ring/pinion/diff out of a donor car, and it would wear and function properly if I just kept all the shims and bearings together as I removed them from the donor, then reinstalled them in the 'patient' differential housing. Did this countless times, never had one make noise.

So I'm hoping to find a cheap complete rear end to swap in, but failing that thus far, I'm thinking of trying to find an S10 or other GM stock 4.10 gear set in a junkyard, and swap that GM ring and pinion into my Camaro's pumpkin, and onto my existing (good) aftermarket posi unit.

What I don't know is:

1) How to be sure my aftermarket differential is functionally the same as a standard GM 4-series carrier. (Meaning not a 'thick' ring gear designed to put 4-series gears on a 3-series carrier.)

2) Besides an S10, what I might look for gears in. I've never seen 4.10's in any GM stock vehicle aside from the 4x4 S10 I had years ago.

3) What year(s) the Camaros and S10's went from the 7.5 to the 7-5/8" rear differentials. And/or if that was the same year for both models.

If I could find a good complete 3.42 or 3.73 stock rear end to swap in, I could live with that, but I do love my 4.10's.

I know this is a half-*** scabjob in/on an already inherently weak GM rear axle assembly, but scabbing it together this weekend for $50 means I get to drive it most (if not all) of the summer, whereas if I have to come up with $500, it's likely to sit in the garage most of the summer. And through most of the summer cruises.

Desperate times call for desperate measures.