CTS V6-3.2L VIN N (2003)
pinion yoke and pinion nut, which should be used when replacing the seal, using the procedures in SI.
When replacing the pinion seal, make sure that the pinion bore is free of excess fluid that could get trapped before the yoke is installed. Install the new
seal and yoke promptly, before excess fluid seeps into the area. It may be necessary to drain some or all of the axle fluid to assure that the pinion bore
remains free of fluid during seal installation. This should prevent the lube from being trapped behind the dust shield.
If a vehicle has had a service axle installed that uses the new 2008 model design, it cannot use the pinion seal kits listed below because of dimensional
differences.
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.
