Andy, I'll bet it's your shifting. Probably shifting too fast and running the rpms up to far. Someone once said that the halftrack has the rolling resistance of a rock. It slows down really quick so making the shift especially in low transfer is kind of an art. As I've driven mine more I'm starting to grind alot less. Also starting to get the double clutching down helps. Straight tooth gears got to match rpms and road speed. Don G.