When the trans was rebuilt last time, the shop put a shift kit and upgraded T/C. We pulled our 30' 5th wheel to N.E. Washington then to Libby Montana. It worked fine. My wife was tired of disconnecting the battery to reset T/C hiccups. Any voltage spike in brake system can cause the T/C to unlock and then lock. The tack would jump up and down. Once reset it was usually good to go for days. We found a donor truck to change to the ZF5. While doing other work on the truck, we found bare brake wires along the frame, the cause of the problem. The trans needs the brain to control the T/C. If you have cruise control, when you hit the brakes it unlocks the T/C, that was where we had the problem. The banks controler was installed when we had the turbo installed. Need more info drop me a PM