Pinion Seal


On some vehicles, seal replacement is a simple procedure that involves removing the pinion flange and replacing the seal. However, always refer to the service manual for the correct procedure and note any special precautions that are to be taken.

Common repair to a differential is the replacement of the pinion seal. Parts involved in a typical pinion seal replacement are shown below.

Parts involved in a pinion seal replacement.
  • Remove the companion flange.
  • Remove the seal with a hammer and chisel.
Removing a pinion seal. Courtesy of General Motors Corporation, Service Technology Group.
  • Install the new seal with a seal installer to avoid cocking or damaging it.
  • Lube the lip of the new seal and the mating surface of the companion flange before reinstalling it.