1977 Chevrolet Pick-up Truck Clutch Kit C20 - 4.1L Engine - 12 In. Clutch/Diaph. Cover - Optional Kit/Diaph. w/ HD Disc - O.D 12 I.D 1 1/8 TEETH 10T guaranteed to replace your current 1977 Chevrolet Pick-up Truck Clutch Kit C20 - 4.1L Engine - 12 In. Clutch/Diaph. Cover - Optional Kit/Diaph. w/ HD Disc - O.D 12 I.D 1 1/8 TEETH 10T. 1977 Chevrolet Pick-up Truck Clutch Kit comes new OEM 1977 Chevrolet Pick-up Truck Clutch Kit aftermarket new 1977 Chevrolet Pick-up Truck Clutch Kit of remanufactured 1977 Chevrolet Pick-up Truck Clutch Kit C20 - 4.1L Engine - 12 In. Clutch/Diaph. Cover - Optional Kit/Diaph. w/ HD Disc - O.D 12 I.D 1 1/8 TEETH 10T.