So I had some issues when I went to Havasu over Turkey Day. The transmission on the truck was acting weird. In overdrive the torque converter was unlocking and locking up again. This issue caused the tranny to get hot and puke out some fluid. I could not figure out the problem. I have been searching all the Diesel forums looking for info but I could not find anything. Then today I made a breakthrough. The problems appear to be caused by the LED taillights. The LED lights don't provide enough resistance for the trans lock up circuit.
I need to add a 5watt resistor inline with each tail light. I will be making this mod this week so I can get my new T4 onto a trail ASAP.