For anyone interested the TCM is located on drivers side under dash up and to the left of brake pedal. This is on a 2013 ram 4500 6.7 cummins AISIN Trans. If you google as i did it will say that it is built in to the ECM on side of block, NOT TRUE!! Part # for this one is 05150771AG feel free to look it up. Only trucks with the 68RFE trans will the TCM be inside the ECM located on side of engine block.