The 68RFE is plagued by small overdrive clutch packs, a weak low sprag, late torque converter lock-up and inadequate line pressure. Typically, these issues can result in the failure of the stock transmission with just a mild tune or heavy trailer. ATS set out to create a product that addressed these concerns. What is the ATS 68RFE Co-Pilot? The Co-Pilot consists of a controller, harness and coil box. The harness is wired into the valve body connector that plugs into the transmission. The installation is also made easier with an included MAP sensor adapter, so the controller can read engine load based on boost. The controller mounts in the cab and allows the driver to adjust line pressure and shift firmness. These adjustments are made by depressing the up or down arrows. These changes can be made on-the-fly or with the vehicle stopped. The coil box is mounted to the driver?s side frame and requires no cutting or fitting. What Does the ATS 68RFE Co-Pilot Do? The Co-Pilot controls line pressure, clutch timing, and by-passes the low sprag under high torque situations. Line pressure is limited in a stock 68RFE to 170 PSI. Unfortunately, this is not high enough to reliably prevent clutch slippage above 400hp. The Co-Pilot reads boost pressure and throttle position to quickly take control of line pressure when it is needed. However, when the vehicle is driven lightly, line pressure is near stock for comfortable shifts. This is all done automatically in the controller. How much line pressure can be generated varies on whether it is a stock or ATS transmission. On a stock transmission, the Co-Pilot can reach max line pressure quicker than the factory TCM commands. This helps in avoiding clutch slip during the change from constant speed to quick acceleration. On an ATS-built 68RFE, line pressure can be nearly doubled to increase holding capacity and prevent clutch slip. Clutch timing is programmed into the Co-Pilot and crucial to clutch pack life. On a stock or ATS transmission, clutch timing is optimized to reduce wear on clutch packs, efficiently transfer power and increase reliability. The 68RFE low sprag assists in transferring power between 1st and 2nd gear. With high mileage, or more power than stock, hard acceleration in 1st gear can cause the sprag to fail. Catastrophic transmission failure will result. The ATS Co-Pilot routes power around the low sprag to eliminate this potential failure. In summary, the Co-Pilot for the 68-RFE controls the transmission in a more ?dynamic manner? than a ?static? program such as the factory TCM. Utilizing signals from the boost sensor, throttle position sensor, turbine speed sensor, output speed sensor and several other inputs. The Co-Pilot can control the transmission in a much more driver-friendly way. You will notice the engine has no dead spots or does not ?bog down? under load. Under heavier acceleration, and when the engine is producing higher power levels, the transmission will transfer more power to the ground. This is because the Co-Pilot increases line pressure based on engine load ? thus, transferring power to the wheels and eliminating slip and heat in the transmission.