Mounting of an automatic transmission shifter using a rod and lever can sometimes let body/chassis/engine flex "unshift" a gear. Using a pull rod (31/48-inch diameter will do) mounted loosely in a ring can prevent this problem. The ring should be mounted to the rear of the transmission with a bracket. However, because the rod is loose in the ring, the bracket can often be mounted to the seat bracket or another place inside the car. The length of the rod and bracket will vary from car to car.