Owned my 99 LC for 14 months now, love it, but I'm no mechanic by any stretch of the means. I've been a full blow cruiser addict, though, ever since joining the club and read constantly the various issues concerning our rigs. In doing so, can't say I've read much, or anything, about blown head gaskets on a 100 (plenty in the "80s" section). Do a few searches and perhaps that will answer your question.
Several of us have had front diffs blow out. There are several good threads here explaining the circumstances in which it occurred. Knowing the typical cause will reduce the likelihood of finding yourself in a similar situation. I moderatly wheel my LC and have not had an issue with diffs. (my rig just flipped 130k miles).
Good service history and timing belt/water pump around 90-100k miles is a good indicator of the previous owners attention. I believe the service manual will recommend another belt/pump change at 180k.
goodluck
Several of us have had front diffs blow out. There are several good threads here explaining the circumstances in which it occurred. Knowing the typical cause will reduce the likelihood of finding yourself in a similar situation. I moderatly wheel my LC and have not had an issue with diffs. (my rig just flipped 130k miles).
Good service history and timing belt/water pump around 90-100k miles is a good indicator of the previous owners attention. I believe the service manual will recommend another belt/pump change at 180k.
goodluck