K015 700R4 3-4 Full Throttle Up-Shift Sleeve. The Full Throttle Up-Shift Sleeve will service all 700R4 valve bodies 1981 through 1993. This sleeve allows full throttle 3-4 up-shifts. The 4-3 detent will become less sensitive at part throttle. The 700R4 Up-Shift Sleeve can be installed without removing the valve body from the case. Don’t use this part unless you have under 350 flywheel horse power unless you have a extremely high performance 700R4 transmission. Doing so will burn the 3-4 clutch up.