The lift will when put in reverse(only) hesitate then will accelerate. Only does it on when you first accelerate in reverse. Then will operate normally. I changed out steer sensor, accell potentiometer. Main controller all with new parts still problem exists. It dose not do it in forward and only when wheels are on ground. If there is no load on will operate normal. I have pulled both transfer cases apart and inspected both for possible missing teeth on gears or broken motor shafts. Everything checks fine and normal.