I have a 2004 F350 DRW 6.0 with an automatic transmission. The Trans temp gauge is working only intermittently and when it quits, the check gauge light comes on and the tow haul light blinks. It only does it when the tranny warms up and seems to reset after it cools. I am thinking bad tranny temp sensor but am looking for an expert opinion before I just change it.
Upgrades to the truck include Diablo tuner, EGR blocked off and 4" no cat/muffler exhaust.
Any help is appreciated!