just the input shaft bearing. it's the only one giving any trouble and from some online research, it appears to be a common problem on these transmissions. the synchros are a little worn but i don't care. i've lived with worn synchros in all my other cars. the growling ISB was a little worrisome though so i wanted to deal with it. also glad i pulled the old clutch off because it was down to its rivets, and the throwout bearing was way worse than the ISB. funny though because it made no noise.
didn't take long to disassemble the trans. maybe an hour? i used a link that i think you posted in another thread, this one
DIY: Tranny removal and Input Shaft Bearing change - D-series.org
i didn't have any problem with the snap ring though. my biggest problem was the one of the dowels that lines the two halves of the trans housing up was corroded so i had to slowly pry it apart by banging a cold chisel in between them. it was also a little tricky lifting all the gears out but i got it. been waiting for parts forever, finally ready to move ahead. i think i will have to pull that seal back a bit before i put it back together though.
if anyone else is positive about the depth of the seal, please let me know.