My 54 1/2 ton was not stock when purchased. I was told that the rearend assembly was from the mid-70's, from either a Nova or a Malibu. Trying to find out more specifics.

The casting information on the driver's side is an "N", then "F17". Also on driver's side, upside down, are the numbers "1251502". On the passenger side, upside down, is "GM19".

All help appreciated. Thanks. Williejoebob