My '87 has transmission oil leaking from where the selector shaft enters
the transmission case. Is it fairly straight forward to replace the seal
with the transmission installed? This is a syncro if it makes a difference.
I see van-cafe has a write-up here:
http://www.van-cafe.com/home/van/page_131_783/transmission-selector-shaft-seal.html,
seems like it's not particularly difficult.

Thanks,
Mark
Seattle, WA