Transgo GM/Chevy 4L80E 4L85E Actuator Valve Refill Kit. This Super High Quality Kit is made by Transgo. Fits General Motors 4L80E and 4L85E 1991-2009. Refill for 48-ACT-TL Boring Kit: Has enough Valves and Springs to do up to (6) units. "No Tools included" Addresses Low Line pressure; clutch burn up; wrong gear starts; neutrals on 4th. Installation recommendation: Experienced technician. Transmission removal necessary: No.