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I am a little unclear as to what's going on when you put into neutral. Are you saying in neutral it still wants to move forward? Are you 100% certain that the linkage is attacked and moving correctly when you move the shifter from Park to low?
On this vehicle reverse the strictly hydraulic/mechanical situation. If there's absolutely no engagement in reverse and you are 100% certain that the linkage is corresponding on the shifter then the problem is an internal fault in the transmission. If neutral doesn't exist and it goes forward in neutral there's some type of hydraulic issue in the transmission.