Re: Neutral???
Try spinning the prop. If it locks when you turn it in the CLOCKWISE direction then you are in reverse and your intermediate shaft went onto the lower shift shaft "off a spline" because the gearcase was in reverse rather than forward when you put it together. Do this: Drop the lower, turn the lower shift shaft (short splined shaft in front) all the way clockwise. Turn the prop COUNTERCLOCKWISE til it locks and use a bungee to hold it there (you are now in F). Make sure the washer is in place on the lower ss, the control handle is in forward and the top of the intermediate shift shaft is pointed straight ahead (pix) and put it back together.