A premium mid-size SUV, the 1999 GMC Jimmy seats five passengers and is available with 4WD. The 1999 GMC Jimmy is a mid-size SUV, and is the up market version of the popular Chevrolet Blazer. The Jimmy 's available engine is a 190 hp 4.3L V6 which produces 250 lb-ft of torque. The V6 is paired with a four-speed automatic transmission which helps the Jimmy achieve 21 mpg on the highway.