GMC Sierra 1978 Manual Gasoline mileage: 154 KM GMC Sierra Bahbahani 1978. The car's engines are sound and working. It only needs a flywheel, and the flywheel is available but hasn't been installed due to lack of time. Selling for parts only, if you want parts, take it whole. The car has been with me since 1405 AH. Its registration is available and paper-based, and its plates are the old transfer type (8 digits). The car's original color is red. Selling for parts only! The car is for interested enthusiasts.. It has been offered 12,000 (twelve thousand) by a serious buyer.