PMPS Cross Cummins Diesel(10-15 PSI Increase) 4-way 4 pin Wiring harness Chrysler 68RFE DIESEL, Electric line pressure booster, Line Pressure Booster 10-15 PSI Increase Over OEM (68RFE) 07-Up Diesel (Sonnax), Features: Achieve shorter shifts and increased torque capacity without creating low-speed harshness, Improved band and clutch holding capacity for increased durability, Progressive pressure increase as driving conditions become more demanding, All the increased line pressure without overloading the pump at idle, The Prescription for Optimum Pressure, Stronger pressure regulator springs raise pressure equal amounts at idle and maximum pressure. Many aftermarket "kit" springs are a compromise, raising pressure too much at idle and not enough at maximum pressures. Larger boost valves, on the other hand, have a "progressive" effect on pressure, changing the rate of pressure increase. The Sonnax large ratio boost valves and stronger pressure regulator springs are designed to work together. This is an ideal combination: smooth engagements and lower load on the pump at idle, but a greater increase in pressure as the transmission is worked harder.