I have a 1996 XLT Special with reverse. This Year when i put it into reverse i hear a grinding and it moves a bit. The sled works fine going forward. I have checked the reverse cable and that works and checked the crankcase oil level and adjusted the tension on the chain. It still makes the sound. I can turn the secondary clutch and the track does move when its in reverse so i have no idea whats going on. Does anybody have any ideas on what i can do?