I was out on my boat yesterday, waiting in front of my buddies dock to pick him up. I went forwards, and reverse a couple of times to keep my boat away from hitting his dock on a rough weekend out on the lake. As we are ready to leave, my boat all the sudden "slipped" out of gear. At first i though it was weeds, but i also lost reverse! Now i can't go forwards or reverse. I checked the prop, and thats fine. I took my boat out of the water and pulled the drive off. It shifts fine! The prop turns when its in gear. What could my issue be?? Cable slip? Should I grease up the shift linkage in the drive? HELP!