Vortec 4.8L V8 SPI and 4-Speed Automatic with Overdrive. Are you READY for a GMC?! What a price for an 09! Looking for an amazing value on a superb 2009 GMC Sierra 1500? Well, this is IT! This truck is nicely equipped with features such as Vortec 4.8L V8 SPI and 4-Speed Automatic with Overdrive. Awarded Consumer Guide's rating as a 2009 Recommended Large Pickup. This Sierra SLE features great styling and interior quality, a roomy cabin, tons of towing power and payload capacities and economical gas mileage from the 4.8L V8 engine that still offers 100 added horses over the smaller V6. SON BUENA GENTE!!!