I just picked up a 1987 4wd 5sp that had been sitting for at least 6 months. When I first started driving, the clutch would chatter pretty bad from a stop. I had this happen on a 2wd and it was apparently from an oil leak that contaminated the clutch plates. On this van, however, after about 5 miles of stop and go, the chatter went away and was replaced by a bit of slipping. That too has improved with driving but I fear a new clutch is in my future. I have replaced clutches on other vehicles, but never a 4wd. Is this something best left to a professional, or can a somewhat handy person tackle this in his or her driveway over the course of a weekend?