Vehicles with Ford ATX transmissions frequently experience poor throttle pressure control, very late or no upshifts and a hydraulic bind on accelerator linkage. These complaints can be the result of a worn throttle control valve sleeve. The hardened steel throttle control valve continuously reciprocates in the aluminum sleeve. This wears the inside diameter of the sleeve and allows oil crossleakage. Regulated throttle valve oil can become open to exhaust, resulting in throttle pressure and shift problems. If throttle valve balance oil leaks, the result can be very late or no upshifts. Sonnax throttle control valve sleeve 86940-03 eliminates these problems.