When I am cruising on the highway, mainly in 4th gear. My shifter rattles really bad now. kinda like a ZzZzzzZ ZZ Zzzz z zz th tht th thth thth Zzz z z z z Z sound. Almost like it is not quite in gear all of the way, but the car cruises fine, and it has never popped out of gear, in any gear. Do you think that it might just be hitting against the rear stop and causing the sound. Or is it coming from the tranny. I checked the stops, and they are the distance that they sould be from the shifter handle according to the instructions, butunder acceleration, which by the way is the only time I here it. Do you think that it is causing the shifter to pull back into the stop and cause this.....Any recomendations are welcome.