Quote Originally Posted by FMS88 View Post
Both service manuals I have emphasize the application of gear oil or grease between the two seals. I suspect the bumps are there to create spaces between the backsides of the seals that retain lubricant and keep the seals happy.
Aww, I see. That makes sense. Thank you for the info! Btw, is there a factory service manual other than the typical Haynes and Chilton that can be downloaded?