I have a 99 F350 SD with a 4r100 transmission. Recently after towing a heavy trailer and the transmission becoming hot, the truck bounces when starting slowly in reverse. This happens only in reverse, not in any other gear. It feels like starting a manual transmission in too high of a gear. It bounces or slips two or three pulses and then smooths out. After the overheating incident I had the filter and fluid changed using a synthetic transmission fluid. When checking fluid level after shop changed it, the level is too high. Is the overfilling of transmission fluid a problem? Did I hurt or burn something in transmission causing the pulsing problem?