Michael,

Not sure if you ever found the problem, just came across this thread. I am not able to find any settings in the lift that would affect the transmission. If you are still having this issue, check the park brake switch and make sure all connections are tight. Also, if you have two brake pedals, one would be the inching pedal while the other is for straight brakes. Try using just one or the other and see if the symptoms change with the pedal. If you did find the problem would like to know what it was. Thanks.