Fits Ford C4 1970-1981 Includes items to restore proper function to Valve body with added performance, much improved drivability and durability. Features: Gear Command (The trans will shift & hold 1st and 2nd gear to any RPM when manually shifted) but retains automatic up shifts in drive position. Raises overall line pressure. 75% quicker 2-3 shifts. More pressure for passing gear between 32-45 mph. Eliminates too easy and too often passing gear. No reverse hot; 1-2 slide; soft 2-3; 3-2 cutloose; 3-2 shuttle. 2nd band failure. Quicker action throughout all shifting. Firm shift performance. A wonderful addition to your OEM Classic vehicle, Competition, Off road, Pro-street or all out Race car. You will love how it shifts. Note: For C5 (1982-1985), Use 1971-Up C4 Valve body and filter. Installation recommendation: Experienced technician Transmission removal necessary: No