Corvette Servo piston kit for the GM 700R4 (4L60), 4L60E, 4L65E, 4L70E, 4L75E THM700-R4 MD8 with all seals. This servo is a must for any performance, towing, RV/off-road transmission, but would be a nice upgrade for any 700-R4 or 4L60E. Right away you'll notice faster and firmer 1-2 and 2-3 shifts. This servo will give your transmission 50% more apply pressure, just what you need to keep from burning your transmission up under heavy load situations. This servo is easy to install and can be done with the tranny in the vehicle. The kit comes with all of the necessary seals for installation including the outer cover o-ring. Chevy GMC Pontiac Corvette Camaro Firebird Tahoe Yukon Escalade Denali Truck Hummer H2 H3 & More.