I have a 1969 Firebird 400 I'm restoring, and the numbers on the axle housing don't match any on the tech list. The only numbers I found were on the passenger side axle tube, facing the front of the car. They are CPR 0422G2 and below that is DGW. Can anyone help me decode this?

My 68 is stamped on the rear side of LH axle tube about 4" left of the pinion case. The forged numbers do not help. It's stamped like the engine code.

How's that Vegas car doing, I remember when you dug it out of it's tomb.

The numbers (CPR 0422G2 and below DGW) are the numbers and letters that were physically stamped into the tube it's self. I can't find anything that matches up with any of the Axle Identification Codes on the Drivetrain ID Number page. Trying to figure out if it's the matching number rear end, and if it's a standard, or safe-t-track rear end. The PHS documentation wasn't the least bit helpful with much of anything, other than paint color codes, engine size, and upholstery. All of which I already knew from the cowl tag. Apparently a letter decoding the options (when necessary) wasn't all that "necessary" in my case. All I got were the bare basics. The decoding would have been nice.


The car is coming along nicely. Paint is done, and I'm starting reassembly now. Should have it completed and on the road by the end of August.

Actually the PHS has a load of information. Did you receive a copy of the billing history? That has all the as-built details. If you ordered by fax, you should have received a follow up packet with the full decode by mail. If not, we can decode it for you if you post it.

How about a couple of photos of the rear end showing the rear cover? I am betting that it's going to be a 10 bolt 8.2" '70 Chevy originally with 3.08 posi rather than a Pontiac rear. The rear diff cover on a Chevy is round/oval; on a BOP it has scallops on left and right.

I had to dig to find mine. Have a look:
Axle code

I ordered my PHS info via mail. My packet only had the bare basics hi-lighted. I e-mailed them about it, and never got a reply.

I'll see if I can get it scanned to get some help with the decoding.

I'm thinking my rear end is a Chevy, and not a Pontiac as well. These are the only pics I have of the diff right now.

That's exactly where I got my numbers and letters from. They are stamped into the housing. Btw, this is a late 1969 (9/69) car. I don't know if that makes any difference, but it ight have something to do with the odd numbers. Other items on the car are date coded for a '70, although my spark plug wires are original, and date coded for 9/69.

Look at your VIN. Is there a "1" or "5" after the letter?
PM the VIN to me if you like.