I have a B/W 72c that is removed from the boat. When i spin the input shaft with my hand the output shaft spins. I can hold the output shaft and spin the input also. Does this mean the clutch plates are sticking? Tranny has not been run in 2 yrs?

That is most likely not a problem. Just the drag from cold oil in the tranny moving along with the clutch pac will cause the output shaft to follow along. --- Jer