have an 88 iroc . it is stock with a 350 tpi. from looking around online it should have come with the rear disc , and looking under the center console lid (rpo codes) confirms this .
but when i got the car it had a drum rear , so it was obviously changed .
i am trying to find what this rear came out of .

the cover has 10 bolts . there is a # on the bottom of the rear under the cover "22522876" .

Pass side axle says 6jh c2 16 2 ..
im not sure if there was a # in between the 6 & 2 ...

please help me identify this .. if you need any other info let me know ..

 

Sounds like you have a 7.5" 10 bolt and that's about all anyone else can say about it. If you pull the axle code off the front of the passenger side axle tube closer to the center of the diff, we might be able to tell you a little more or at least what year the diff is but internally, it could be anything. You'll never know if the previous owner changed the gears or carrier (posi, open etc) unless you pull the cover and have a look. The axles could have been replaced and could be 26 or 28 spline.

 

Looks alot like the casting number for the housing for the 82-up F-body 7½" 10-bolt, up to whatever year it was they added ABS...

So that's probably a 7½" 10-bolt rear end out of a 82-93 or whatever F-body.

Beyond that, it tells nothing.

Doesn't make a lick of difference what it "came out of"; it's not in it any more. Even if it was out of a turbocharged 86 IROC with a 350, a T-5, and T-tops. The magic is gone now. It merely is whatever it is.

Take off the cover and look.

 

they are really hard to see , but from what i can tell it says ,

6jh c2 16 2 ..

im not sure if there was a # in between the 6 & 2 ...

 

i was just wondering if it came from a v6 car and if it had limited slip or not for when i change the fluid .. i dont really care about the gear ratio .

 

Those don't look like the numbers you need....

On the side of the ring gear it'll say "41:11" or "40:13" or something like that; that's the ratio. 41/11 = 3.73, 40/13 = 3.08, etc. If those aren't there, just count the teeth.

And of course, there's no numbers at all on the carrier that are meaningful; you just need to see if there's anything inside there besides the cross shaft, the side gears, and the spider gears.

{edit} Just have a bottle of additive on hand for when you're done, and if you see a posi, put it in, and if you don't, don't. Put the bottle on your shelf and keep it in stock if you don't need it, sooner or later you probably will.

 

those are the #s from the passenger side axle tube .

 

Oh well, there's no gears or carriers over there... so who knows if those have any connection to whatever's inside the housing now... in the amount of work and time you've spent dinking around with those, you could already have had the cover off, know what you need to know, and be cleaned up and doing 12-oz curls already.... in fact I think I'm going to do a couple of reps of that exercise msyelf right now.

 

not in a mud drive way , not every1 has the luxury of a garage . i only have access to a garage about 2 days a month . im poor , i just layed on a piece of card board to get the #s Stephen asked for .

this is why i am trying to find out before i get the chance to change it .
also i took the part # from here for the additive to the local gm dealers and they are all out so i dont want to spend the extra $ and trouble to get it online if i dont need it . if it was that simple i would have done it ..

 

Yep, those are the axle code numbers.

6JH = 1984 3.23 gears, open diff.

At least that's what was originally in it in 1984. Now you need to pull the cover off to see if it still has an open diff and 3.23 gears.

The rest of the numbers, c2 16 2, are what plant it was built in, the day it was built.

C = Buffalo
216 = Day of the year
2 means it was a night shift.

So a 1984 3.23 open diff. 3.23 gears were only offered in a couple of models in 1984. I have no way of knowing which ones came with posi so we'll assume the better models , Z28, got them. That leaves a Sport Coupe with a 305 and manual transmission or a Sport Coupe, Bertinetta, Firebird S/E with a 2.8 and automatic transmission.

Not that any of it matters. The housing is from an 84. What's inside it could be anything. Other than a gear ratio, there's no difference between the diff in a V8 or V6 car. They're both equally weak.

 

your the man ..