here are an few pictures of the clutch installation adapter I made for one of my transmission jacks. the snap-on puller is used to clamp the old input shaft rigid. prior to removal, the puller is loosened off to make it easier to push the shaft all the way through the discs into the pilot bearing and then tightened before removal of the clutch assy. alignment dowels are also used. if re-using the clutch assy I use the small wood blocks between the release bearing and the clutch cover. this stuff is old news to the experienced people on this forum but may be of use to someone who has not replaced a heavy truck clutch assy