I had the same thing happen 3 weeks ago. Cruising speed. 'Pop' (a jerky, kick-down, really). Check Engine Light came on. Now in 3rd gear. Wouldn't downshift at stop sign. I turned off engine. Restarted. Transmission shifted right, but R-N-D shifts with a sloppy 'bang' (like a bad u-joint). I disconnected the battery. Waited 2 minutes. Reconnected Battery. Ck Eng light gone and truck back to normal. After 1200 miles of my regular driving, its fine. Good Luck.