I took my pontoon out at the beginning of the season and had trouble with reverse. It would grind continuously but did back off the trailer. I took it out for the day and it did fine. I went ahead and replaced the shift cable as it was adjusted as far as it could go towards reverse. It did fine the next time out. I took it out last weekend and it started grinding again as I backed off the trailer. I guess the damage was already done to the gears. I read there is a clutch dog that will need replacing along with a reverse gear set. How hard is it to replace them and do I need any special tools or do I need to start looking for another foot. What years and horsepower gear cases will work? Thanks for any input!