i have a 1985 iroc that came with a 5 speed and a 305 (LG4). I am trying to find out what my axle stamping code means but cant seem to find out anywhere? It goes like this

9PD C10 9 2

Any help would be appreciated.

 

Forget the stamped numbers on the axle tube, Mfg info. Check your RPO codes for the Gear ratio that was stock for your car.

 

I can decode for you tonite.

 

The only reason why I am asking is because I have been doing research and I cant seem to find these numbers for the '85? It seems that this rear end might be from another year camaro? Or maybe it's just me? LOL

 

Can't help with decoding. My 85 IROC (LG4, T-5) had stock 3.23's.

JamesC

 

I took off the diff. cover and it is a 7 5/8" rear end with a 3.23, and I believe it is a non-posi, because I didnt see andything in the middle of the carrier except for the 4 little gears and a center pin, there is no spring in the middle, I guess that would make it a non-posi?

 

http://www.hioutput.com/tech/ratio.html
But it doesn't show a 9PD code either.
The remaining nembers and letters are date and location codes.

 

Sounds like someone swapped the rear out. It should be a 3.23, maybe a posi, maybe a open diff. Those codes are

6JH - Std.
6JZ - Posi
6KZ - Posi
6PZ - Posi

 

well its definately not a posi, that sucks, ohh well time to upgrade...lol, found a 9 bolt posi with disks for $300? Sound good?

 

Only if its a 1989 9-bolt with the 11.655 rotors & PBR aluminum calipers. All are Limited Slip with these ratios 2:77. 3:27 & 3:45.

 

I was thinking just to upgrade what i have, so I was wondering....if there are 26 spline axle shafts in there now and a non posi, can I put in 28 spline axle shafts and a posi differential? If so do I have to get different bearing due to the fact that the axles would be thicker? What needs to be done to convert to this? Thanks

 

I give $170 for my 9 bolt with all the calipers, brake lines, e-brake cables and with 3.70 gears