PLEASE NOTE: This is an exchange listing. You will receive a prepaid label in the box. Simply put your old actuator in the box and ship it back to us to receive a partial refund of $50 to your Amazon account AND to activate your warranty. We do NOT accept any aftermarket modules and will not issue a partial refund for aftermarket or critically damaged modules. This actuator exchange offers a completely rebuilt and upgraded replacement actuator compatible with 6.7L Cummins in light or medium duty trucks. After installation you will need to calibrate the actuator. Calibration can be performed with any standard, capable tool. Part Numbers: 3778619 3778623 3784299 3785180 3788932 4034090,4034168 4034309 4034394 4034395 5452652 5456326 5456327 5641695 5459882 5494878 6374774 5601240,6382096 5579127 4034090nx 4034168nx