I need to I.D. an axel i bought .. i was told its a 70s firebird 10bolt... i Know its a 8.5in, posi., with 3.08 gears. can anyone decode it or better post a link of a site that has a chart to decode it..Thanks

What do you need, codes from the axle tube? These may tell you what factory gears were.
http://www.nh-gto.com/GTO%20Axle%20Codes.htm

The code on the axel tube is 2pwg3532.. i want to know what it is off..like the year make and model..

If it's an 8.5" for sure, and the spring perches are on the bottom, it's either a Nova or a Camaro/Firebird rear end. http://novaresource.org/axle.htm has measurements for '68-'79 Nova rear ends. Camaro/Firebird 8.5" rears are a couple of inches wider.

The 2PW code shows 3.08 Posi on the Nova site
The G code shows Chevy Gear & Axle Posi Carrier
Not sure about 3532, maybe 353rd day, 1972
Look here to see Pic where to find your casting date code.
http://www.nastyz28.com/index.php?page=camarorearaxle

Should look something like this (/) L 29 2 (/) L=December, 29th, 1972

Look here to see what type housing, look at the ribs on side of housing.
BOP/Buick,Pontiac or Olds
http://www.oldsmobility.com/10bolt-tech.htm

i thought early first gen firebirds had a 10 bolt but ti wasnt the 8.5inch.i thought it was a weak 8.2"..correcet me if im wrong unless they swapped it out.. mark

67-Early 70 Camaro had C-clip 8.2", 67-70 Firebird had 8.2" Bolt in Axle, Late 70-81 Cam/Fire had C-clip/Bolt in 8.5", 77-81-Z28 & TransAM had 8.5" also.
8.2" W/1.438 Pinion & 25 Spline is weaker than 8.5" W/1.626 & 30 Spline. 12Bolt has 8.875" W/1.626 Pinion & 30 Spline.
8.5" has .375" smaller ringgear.
I had a 69 Nova W/8.2" that out lasted 2 SBC350's, 1 BBC402 & 1 BBC427. It was still together when I sold it. How I don't know.

Thanks for all the info .. now i can get replacemet parts alot easyer....THANKS

no problems...mark