Before they take the clutch out have them start the truck up wjth just the trans removed. If the vibration is not there it is in the trans. Could be front input shaft bearing. Can you remove slave cyl. and see if it is riding on the throw out bearing ? Some slave cyl used to have and adjustable rod. Maybe wrong slave cyl. Does clutch pedal vibrate when you put slight pressure on it? Check around where bell housing meets block see there are no gaps. I once had a truck have a glob of grease road dirt fall between and bell housing did not meet up flush and played heck with the clutch. Also dowl pins on block could have pulled part way out and not letting bell housing to seat to block. Also check input shaft splines could be hanging up on spline.

Well it's fixed.

the shop replaced the clutch and pressure plate and the vibration is gone .

either someone did something wrong and didn't notice or admit or the parts were actually bad .

all I know is it's back to how it was before

thanks all

Me too I'm so happy to have my truck back .

the guy apologized and offered me a discount on other work but I think I'd rather work on it myself .