Pinion seal

["Vito Pacione" <classic@m2.interserv.com>]

Does anyone have a good way to replace the pinion seal without 
screwing up the backlash? Also what is the best seal type to use to 
cure a leak and for longevity?

I understand that leather won't wear the pinion shaft, but probably 
won't last as long. The rubber seals will probably wear into the 
shaft over time.

I only want to this once more. I finally got rid of the other leaks 
on the diff and I am looking forward to a dry rear end.