Tundra gains a crew-cab body style for 2004, allowing Toyota to claim its first true full-size pickup truck. The Double Cab joins carryover 2-dr regular cabs and extended-cab Access Cabs. Access Cabs have two small rear-hinged doors that do not open independently of the front doors. Double Cabs have four conventional side doors, plus a power-down rear window. Regular cabs have an 8-ft cargo bed, Access Cabs a 6.5-ft bed. Double Cabs have a 6.2-ft box with walls 4 inches higher than on other models. Double Cabs come with front bucket seats; others offer a bench or buckets. Both Access and Double cabs have a 3-passenger split fold rear seat. Double Cabs use a special frame that adds 12.2 inches to the wheelbase and 12.6 inches to the overall length of other Tundras. They're also 3 inches higher and 4 inches wider--close overall to Ford's F-150 SuperCrew crew cab.

A V8 engine and 4-speed automatic transmission are standard in Double Cabs and available in other Tundras. Regular-cab and Access models also offer a V6 with manual transmission or optional automatic. The regular-cab comes in price-leader base-grade trim and along with other models offers SR5 and upscale Limited models. The V8 Access Cab StepSide has a flared-fender cargo bed. All Tundras offer rear-wheel drive or 4WD that must be disengaged on dry pavement but includes low-range gearing. Four-wheel ABS is standard; rear disc brakes are unavailable. Limiteds have a standard power sliding rear window and offer optional leather upholstery. Exclusive to Double Cabs are optional antiskid/traction control, sunroof, and rear DVD entertainment. Available TRD Off-Road Packages deliver special tires, suspension, and trim.