I just did a Mark 55 the other day - same procedure. I prefer to put the shift rod in neutral, with the upper also in neutral. I do this, because I've had issues with the shifter going beyond forward or reverse on some models as there isn't a stop inside the gear case to prevent the rod from rotating all the way around. Neutral is a positive spot on the cam, easily found by feel as you rotate the shift rod. Grease the driveshaft and shift shaft lightly before assembling.