ShiftPlus Electronic Shift Improver Application: Ford RWD and 4WD trans code D,E,P,U,H,L and V (found on plate on driver door post) 1997 Expedition/Navigator 1995 to 1997 Explorer 1995 to 1997 pickup F-150, F-250, 1994 to 1997 F-350 1994 to 1997 Mustang, Thunderbird and Cougar 1993 to 1997 Lincoln Mark VIII Recalibrate your automatic transmission for optimum performance and extended life! Select the mode that best suits your application. For late model automatic transmissions. Reduces slippage and heat! 50 state emissions legal. Installs in minutes ShiftPlus simply recalibrates your transmission's hydraulic system electronically. The ShiftPlus shift firmness not only makes driving more fun and pleasurable, but slippage and heat are reduced - extending the life of your transmission! This new design allows you to improve the transmission's shifting performance without removing the transmission pan or valve body. A simple flip of the switch allows the transmission to operate in the performance mode. Flip it back and you are back to stock!