@Scottymechanic I no longer have the car but it still puzzles me to this day. A local transmission shop checked it out and had no clue what was wrong. Any ideas?
@Scottymechanic Scotty, a few years back I owned a 2009 Chevy Impala. It would start out just fine but after about 20 miles the transmission would jerk very hard with every shift. I could pull over and shut off the engine then restart and it would shift fine for another 20 miles.