Ford and Lincoln Mercury AOD 1979-1993 Notice: This product will not work with nor do we provide calibration assistance for Low Ratio Planetary Gear set from (4R70W) unit. Includes (4) governor valves for max throttle shift tuning; new boost valve with springs for tuning high performance engine applications and our patented High Temperature rings for forward clutch. Includes pan gasket and both valve body/separator plate gaskets with various other items/procedures for shift feel and calibration. Short, Firm Shifts with Performance, Durability and “CLASS”. Tunable wide open throttle shifts from 5500 - 6800 RPM. Be cautious when tuning max throttle shifts to avoid engine damage! This Kit does not provide a wide-open throttle up-shift to 4th. Trans will have full automatic operation in OD or D position. NOTE: "For this kit to hold 1st, 2nd and 3rd to any RPM", For 1st gear place shifter in 1st position manually, upshift to the 2nd/D position for 2nd gear then immediately pull shifter back down to the 1st position " It will stay in 2nd gear", when ready for 3rd gear, shift to the 2nd/D position again it will now go to 3rd gear and when ready for 4th gear/overdrive move shifter to the 3rd/OD position. Installation recommendation: Experienced technician Transmission removal necessary: No