STS RWD V8-4.6L VIN A (2006)
Rear Axle Pinion Cartridge Casting # 6457038590
A service axle that uses the 2008 production style seal can be identified by a casting number visible on the pinion cartridge casting immediately behind
the yoke. On a rear axle, the new design casting number is 6457038590. On a front axle, the casting number is 6507022390. See the pictures shown.
If the vehicle has had a replacement axle that has a pinion cartridge with one of these numbers, the pinion seal leak should be repaired using the current
production pinion seal (GM P/N 25861283 for a rear axle, or GM P/N 19132939 for a front axle).
If the vehicle does not have front or rear drive module with a pinion cartridge as described above, it has the seal design used in 2007 and earlier model
years, and should be repaired using the parts information below.
