GM 4L60E Transmission Transgo Valve Body Reprogramming Kit Fits 4L60E, 4L65E, 4L70E and 4L75E 1993-2011 Except Hybrid units. Perfect for Crisp muscle car or full race shifts. Puts the driver in command. Holds 1st, 2nd, 3rd to any speed. Backshifts to 3rd, 2nd and 1st by moving the lever. Assistance Video Includes: 7-CS (High RPM Clutch Spring Kit) 4L60E-BOOST (.500 Boost Valve) NOTICE: 98 up: If vehicle has Torque Management this kit will not make hard shifts. However many aftermarket programmers for engine performance reduce Torque Management. Special Instructions: Does not require transmission removal for installation. Note: "7-CS" (Clutch Spring Kit) requires transmission removal for Installation if revving over 5500 RPM "4L60E-BOOST" (.500 Boost Valve) After March 2005 an Input Speed Sensor was added which requires transmission removal for installation. Previous to March 2005 does not require transmission removal. Installation recommendation: Professional technician Transmission removal necessary: Yes