Tundra's new iForce V-8 is a thing of mechanical beauty, with mostly aluminum construction and dual-overhead camshafts providing variable intake and exhaust-valve timing. About the only technical tidbit it lacks is direct fuel injection. With 310 hp on tap, this engine never broke a sweat hauling my 3,540-pound boat and trailer. Standard with the part-time 4x4 driveline ($3,050 extra), the new 4.6-liter V-8 wriggles in between Tundra's 4.0-liter V-6 and 5.7-liter V-8, and is mated to an electronically controlled six-speed automatic transmission. A handy toggle on the column shifter delivers expeditious gear changes, taking the strain out of grades.