Next time you put it in the water idle out through the channel and run it through all the gears. You may want to lightly put a load on it. Run it on plane for a minute then stop,shut it off and check it. Without park that is the best reccom. I can make. I would also suggest putting the parking pawl back in order so you have park. Having Park is nice cause you can run the boat on the trailer without the propshaft spinning as it will still spin slowly in Neutral as there is no resistance like there is in a car with wheels on the ground. I run my Schiada on the trailer in PARK and it locks the propshaft out and SAVES THE STRUT BUSHINGS!!!!