Toyota redesigns its truck-based midsize SUV for 2003. 4Runner gains side airbags and its first available V8 engine, but retains 2-row, 5-passenger seating. Compared to the 1996-2002 version, 4Runner's wheelbase is longer by 4.5 inches, its body by 5.7, and it's wider, taller, and 200 lb heavier. It shares a basic design with the new 8-seat GX 470 SUV from Toyota's Lexus division.

SR5, Sport, and Limited models are offered. Their liftgate includes 4Runner's traditional power tailgate window. A 245-hp 4.0 liter replaces a 183-hp 3.4 as the V6 engine. 4Runner's first V8 is available in all models and with 2WD or 4WD. The 4.7-liter V8 has less horsepower but more torque than the V6. Both engines use automatic transmission, the V6 a 4 speed, the V8 a new 5 speed. The V6's 4WD can be left engaged on dry pavement. V8s have all-wheel drive. Both systems include low-range gearing and 4Runner's first hill descent control. New hill ascent control is standard on all models, as is a traction/antiskid system and antilock brakes, now with 4-wheel discs. SR5 has 16-inch wheels, the others have 17s. Sports have a nonfunctional hood scoop. A firmer sport suspension is standard on Sport and optional on the Limited. A load-leveling rear air-spring suspension is optional on V8 Limiteds. 4Runner's first side airbags come as an option combining front torso side airbags and head-protecting curtain side airbags. Other new options include a navigation system and rear-seat audio with wireless headphones. Towing capacity is 5000 lb.