My 98 Expedition 5.4 with 4r100 tranny has a new thing that has started. When using the gear selector to shift through gears, all gears have a positive position, but finding reverse takes a little finesse. I can still select it, but it is not a positive feeling locking position. I had the range selector on the transmission body change a couple years back if that matters. Any ideas how I can get that reverse position back to a more positive engaged position when selecting gears?