My 98 12v seems to have a intemitent problem with clutch, about 6 months ago on highway the clutch would not release when pushed on pedal, problem cleared up after driving 100 miles, now sometimes when I start truck I can't get it into gear unless I shut off truck and start it again, any ideas?

 

I don't think that you can adjust the clutches on these. They are hydraulic so they just adjust up when they need to. Sounds to me like you might be on the last legs of yours. Better enter the drawing in the site news. . . but if you win and I don't .

 

Sounds like your throwout bearing is on it's last legs.
The clutch is non-adjustable.

 

Exactly, pilot bearing might have a lil to do with it also