Short reply on the idea of a shaft alignment. I will look and see if I have a detailed book somewhere also. The idea is to have the flat face of the output shaft on the transmission square to the flat face on the coupling on the propshaft. This is done by disconnecting the two and inserting the same thickness feeler guage on opposite side of the coupling. If one side or top and bottom is tight and the other is loose, the motor mounts need to be loosened and adjusted accordingly so the feeler guages fit snug with the same gap all the way around the coupling. A few problems with this are 1. the strut bearing and shaft packing need to be in good shape, or this will cause vibration and bad readings 2. the shaft must be straight and not bent, as this will cause a good reading in one spot and rotate it and it will be bad 3. this procedure should be done floating in the water, as some trailers do not support the boat as well and will "bow" the hull causing an inaccurate reading 4.-1000 many times this has not been done in a long time and all the parts that need to be moved will be stuck or stick when trying to make the adjustments (hence the beer, patience, prybars, busted knuckles, lost tools (accidentally or intentionally thrown) There has got to be a dealer nearby that can do this procedure properly, but if you are mechanically inclined it is something you can easily do. It is very similar to loading a boat on a trailer in a current, lots of patience and practice!
