GMC Sierra 2012 Automatic Gasoline GMC Sierra 2012, double cabin. I just had its engine rebuilt at Al-Sweid Garage SGR in Riyadh. 6.0 cone, 6.2. It has a new Texas Speed Stage 3 camshaft in its box, full headers, Corsa muffler, and an original Tru-Cool transmission cooler. It also has a sporty thermostat for the engine. The vehicle had a minor accident on the front right fender, but its chassis is sound and available for inspection. The vehicle was recently tuned on a dyno N20 and produced a good number, which I will mention to serious buyers. Contact via WhatsApp. The price is 26. The vehicle has a problem with the transmission. I changed the flywheel, but the problem did not go away.