primary engages perfectly spins the secondary,which inturns spins the shaft going into the chaincase,but it wont spin the track.Although the track spins freely when towed as we found out pulling the damn thing over hill and dell 15 freaking miles in 18 inches of powder near towgotee and teton national park took two 1000s to pull it out.Broken gear off the end of the drive shaft or broken chain????everyone place your bets.