SIERRA 1500 PICKUP 15 4.3L, w/heavy duty heater (opt C42). SIERRA 1500 PICKUP 16 6 speed transmission (opt MYC), 4.3L, opt MSL. SILVERADO 1500 PICKUP 15 4.3L, w/heavy duty heater (opt C42). SILVERADO 1500 PICKUP 16 6 speed transmission (opt MYC), 4.3L, opt MSL.
