I concur. If you're tearing into the tranny at all, replace all seals and bearings, and make sure the output shaft gets the groove for circlip (and install the circlip!). The time and effort required to remove and disassemble the tranny, as well as re-shimming the rear cover, more than makes up for the cost of bearings and seals....
"I don't know what you do, but I know what I do, and I don't do that." --Uncle Doug, R.I.P.
"Without the possibility of death, adventure is not possible"--Reinhold Messner