I am in need of assistance. I have put a lightning engine in my f-150. The lightning engine comes with the 4R100 transmission. I purchased(used from auto salvage) a driveshaft for a 4R100 tranny. It came in, I slipped the yoke onto the tailshaft and the legth seemed good, but the outside diameter of yoke wobbles around in tailshaft....i assume this is not correct and it is not sitting in the bushing. Does anyone know why???? Or do you know of the outside measurement of the yoke on a lightning??? 2000-2001?? Any help would be great! THX!...... I am taking pics of the swap also, i will post when done.