This transmission wants to jump out of gear and then re-engages itself causing a jerking motion. The drive belts have been replaced. I have adjusted the gearshift linkage all the way in both directions, (to where I had only forward and to where I had only reverse) I adjusted one turn at a time to a point that I have both. The adjustment can increase the jerking or decrease the jerking but cannot cure it. It never does it in reverse.