Demonstration of what the J1939 datalink from an electronic diesel engine ECM to the allison TCM does and what happens if it is not connected or doesnt work. aimed at those swapping electronic allisons into vehicles that never had them
It sounds like an Allison AT545 that's on it's way out with the datalink disconnected. I've been a few buses here with ZF gearboxes and they more or less behave the same way when something is wrong with them.
