I suspect it's the throwout bearing. Mine was making a grinding/whinning sound. upon inspection the plastic holder for the bearing was disintegrating.
The manual says, for a clutch replacement remove the engine. I removed the transmission because that seemed easier to me, but I'm not so sure. But if you do remove the transmission, be sure to make the cradle for it. It's a heavy sucker and the proper cradle will make reinstalling alot easier. Also, get some 6-8" long bolts (5 or 6 of them) and saw the heads off. You'll screw these into the bell housing to make mating the transmission alot easier. I can't remember the thread size, but just remove one of your bolts and match it up. I think it's like 3/8 course, but don't quote me on that.
Tom Rowe
Four wheel drive allows you to get stuck in
places even more inaccessible.