Bought boat from original owner. Took it for 2 hour cruise before buying it. Cruising, going fast back to cruising. Boat ran great. Buy it, take it home on trailer, next day bring it to lake. Drove great for 10 minutes and started to grind, or lock up. Something bound up. (Keep in mind)- I was cruising at lowest speed possible when I heard it grind. Quickly put in neutral. It stopped. Tried putting in gear. Grind... Neutral again then gear now there's no grind. Continued cruising for 30 minutes before getting onto the throttle. I ripped it for 3 minutes straight. Ran fine. Back to cruising 20 minutes later.. GRIND! Put in neutral then into gear ran fine all the way to the boat launch!!! Help please any advice will help thanks guys!