The main gears are actually fine. My problem is with the electric reverse not fully engaging and disengaging and it caused the teeth on the outside of the spider assembly to round off into a pointy diamond shape and cause grooves in the casing. Now it doesn't seem to shift properly and has even popped outta gear while riding a couple times with the horrible grind of death not stopping until you kill the motor. I'm just lucky I got it back to the truck and don't want to take a chance of it blowing up in the bottom of a valley or half way back up the same hill I dropped in! I plan on selling the sled after this season, so I really don't want to invest more money than I need to. Just don't want to sell it this way either....