Not sure if that is the problem or not, but the truck starts fine and drives fine. Once I get down the road a few miles the tranny temp gauge drops to zero and the tow haul light goes on and off. Sometimes the tranny temp goes up and the light stops blinking but only for a few seconds. The truck doesn't seem to drive any differently once all this happens. It shifts fine and it drives fine. It all happened just before I deleted my egr. I changed out the tranny filters and oil after the egr delete. The new oil is nice and red and doesn't stink, so I'm kinda ruling that out. I was thinking maybe the thermostat was the culprit, I'm not sure though. Anyone have any similar problems?