Usually the problem with the shifter is a bent rod between the shifter pedal and the small arm on the shifter shaft entering the case, from someone stomping on it to hard. loosening the locking nuts at each end (one left handed, one right handed) allows you to adjust pedal height by turning the rod in either direction . If the rod is bent it may have to be replaced as it will tend to flex not allowing full travel. If it's just the pedal you should be able to apply pressure with an adjustable wrench to bend it back.