I am fairly new to boating and hope you guys could point me in the right direction. Today my Son, bro in law, nephew and I were out fishing with my 88 Gulf Line w a 48 SPL and all was great. The boat ran great all day! We were headed back in at WOT and all of a sudden the boat comes to a stop and my RPM's rev up w a bad grinding. First I thought prop but all was good there. I put it in reverse and it worked ok. So we had to troll back to the trailer in reverse! Everyone was looking at us funny but at least we got back safe. Now with all that being said does anyone know what happend and how to fix. I am mech inclined so I want to do it myselfe. Thanks -Jason-