Ford offers the 2007 Explorer Sport Trac in two grades – regular and extra strength. The base engine is the familiar 4.0-liter, 12-valve V6 common to the Explorer line. Power equates to 210 horses at 5,100 rpm and 254 lb.-ft. of torque at 3,700 rpm, all managed by a five-speed automatic transmission. That’s decent power for this rig, which weighs in between 4,500 and 4,800 pounds depending on configuration; however, optional for the first time on the Sport Trac is a 4.6-liter, 24-valve V8 good for 292 horsepower at 5,750 rpm and 300 lb.-ft. of twist at 3,700 rpm, all mated to a six-speed automatic transmission. With eight cylinders under the hood, the Explorer pickup will pull up to 6,800 pounds, or about 1,500 pounds more than the V6’s 5,310-lb. rating.