I have an 04.5 awd 400 sportsman and sometimes it feels like something is holding it back, if I reverse for a few seconds and then go forward it is fine again. It feels like the brakes are on but I think it is something in the driveline. It occurs in low or high. If it is occuring and I come to a stop and get off I cannot even push the machine but again if I reverse for a second it "unlocks" and I can push the machine. I have read about hilliard clutch problems but am think that is felt more in steering because the front wheels are locked together, I can notice this when going straight ahead. Thanks for any help.