Two weeks ago I posted a question concerning a vibration problem I was having concerning the clutch/engine. Because of the noises I was hearing, the way the engine sometimes felt out of balance, and the way the clutch pedal free play appeared to be changing, and the fact that the clutch is ten years old (no slipping though), I thought for sure I was gonna have to pull the motor to find out what was wrong in the bellhousing area. Well, I was laying under the truck while it was running, and I noticed that the engine seemed to vibrate/shake more than the tranny, and then I noticed a gap between the engine and bellhousing on one side of the truck, none on the other. The bellhousing bolts had all become loose, and one was missing! I tightened 'em all up, the noises disappeared, the clutch pedal free play is good, no weird vibrations, problem solved! Yeeaahh!