Removal Procedure

Remove the torque tube assembly. Refer to TORQUE TUBE ASSEMBLY REPLACEMENT .
Remove the drive pinion housing oil seal (1) and discard.
Important The internal components of the torque tube assembly cannot be serviced separately. If corrosion exits that cannot be polished off, or there is excessive scoring or wear, the torque tube must be replaced as a complete assembly.

Fig 1: Removing Drive Pinion Flange/Yoke and/or Oil Seal
Courtesy of GENERAL MOTORS CORP.
Inspect the sealing surface (1) of the propeller shaft contained inside the torque tube. Polish corrosion off with a crocus cloth.

Fig 2: Inspecting Sealing Surface Of Propeller Shaft

Courtesy of GENERAL MOTORS CORP.