The Stovebolt Site Forums The Shop Area Driveline Rear end decoding

I bought a 10 bolt GM rear end and was told it was from a second gen Camaro- it is stamped drivers side F115 also drivers side c2 passenger side 15 and the casting number is n 1249518 B I have looked at decode charts to no avail, any help would be appreciated? Thank you

The casting number is n 1249518 B gas GM 15 on one ear then c2 on an ear and 15 on another ear and on housing itself is F115 and the axle tube has has GB G124 1 can anyone help decode, Thanks in advance

I believe your rear end originally came from a 1975 Pontiac X body car, Ventura?

Date code: F115
F = June
11 = Day of month
5 = last digit of year, 1975

Axle ratio and Plant code: GBG1241
GB = 2.73 axle ratio
G = Chevrolet Gear and Axle plant
124 = 124th day of year
1 = day shift

3 letter (XXX) axle ratio/plant code format began in 1971, so that's why date code points to 1975 not 1965.

GB never shows up as a 2nd Gen camaro axle ratio code. It does show up on this Pontiac listing. (Look at 1975 axle ratio codes) http://ronspontiacpage.com/reference-pages/rearendcodes.htm.

Unsure whether you have a 7.5 or 8.5 in rear end. Apparently both were used depending upon the engine used.

Hope this helps, good luck on your build.