I have a shudder with my truck shifts while accelerating (45-60 mph or so). I was certain it was the "torque converter chatter" that I have read so much about. But I just read a thread that said it could be the plugs/wires. Before I go and make a mess changing the tranny fluid, should I change the plugs/wires? It is a 95 F150 5.0L Auto 2WD with 180,000 miles. 14 Bolts on the trans pan, Code U on the door sticker.

Thanks,
S.