". ..I suspect the shaft might be out of alignment as i just had the props tuned and this did not help...." Vibration is sometimes difficult to correct.....here is where to look: Sometimes, props come back from the shop with problems. Unless they were computer set, this could be the problem causing the vibration. You should check as follows to see if the shat/engine alignment is proper: When the shaft and it's coupling are disconnected (unbolted) from the rear of the transmission and the shaft pulled back a half inch or so, see if the shaft fits easily back in the circle groove at the rear of the transmission...maybe the engine is high or low, maybe its off port or starboard. If it does not slip in easily, the engine must be adjusted to permit smooth entry of the shaft coupling into the transmission coupling. If it fits in easily, check with feeler guages for consistent spacing between the outer edges of the two couplings. Top,bottom and each side should be within about .002". Let's assume the top space is .005" wider than the bottom..... This means the front of the engine is probably too low or the aft of the engine too high..maybe a little of each relative to the shaft IN THIS POSITION.. But before you do anything, turn the shaft 1/2 revolution...Again check top,bottom and sides...If the top/bottom difference is still about the same, then the engine is,indeed,low...and the shaft is straight (this is good news).....But if the reading changes,let's say top and bottom spacing is now about the same, then the shaft is out of alignment...and it has to be removed and straightened.. It is also possible that the shaft is out of alignment further aft,at the strut, or that the cutlass bearing at the strut is worn and the shaft is loose within. If you try to move the shaft with both hands within the cutlass bearing and cannot, it's probably ok...that is, if you cannot shake it side to side in the cutlass bearing... Good luck, Rob Brueckner Hatteras Yachtfish