Ford C4 1965-1966 Except Early 1965 Mustang For assistance with identification of Ford C4 units "click here" . Includes items to restore proper function to Valve body with much improved drivability and durability. Addresses Soft 1-2 shift, passing gear spin-up, clutch chatter and soft shift to high gear. A wonderful addition to your OEM Classic vehicle. You will love how it shifts. Installation recommendation: Experienced technician Transmission removal necessary: No