ANCHORAGE, Alaska -- Toyota Division is improving its truck engine lines to strengthen the Tundra's position in the full-sized pickup segment.
Toyota wants the upgrades to help the aging Tundra to compete in particular with the Ford F-150, which leads the market segment, and the new Nissan Titan.
For the 2005 model year, the Japanese automaker will give the base Tundra a new 4.0-liter V-6 engine that generates 245 hp and 282 pounds-feet of torque. Both figures represent big gains over the current 190-hp, 3.4-liter engine, which has 220 pounds-feet of torque.
A six-speed manual transmission or a five-speed automatic accompanies the V-6. For its 4.7-liter V-8, Toyota reworked the engine with variable-valve timing. That will increase its horsepower to 282 from 240. Torque will increase by 10 pounds-feet to 325. For 2005, a five-speed automatic transmission accompanies the V-8.
A redesigned Tundra is scheduled to debut in summer 2006.
U.S. sales of the Tundra increased by 11.4 percent in the first seven months of 2004 over the year-ago period, to 63,275.
Last year, Toyota released a four-door Tundra that rode on a 140.6-inch wheelbase and was 230.1 inches long. The automaker developed those dimensions to respond to industry criticisms that the Tundra was a "seven-eighths-scale" full-sized truck.
The V-8 engine changes also apply to the 2005 Sequoia large SUV and the 4Runner lower mid-range SUV.
The Sequoia's four-wheel-drive system also will change. A Torsen torque-sensing limited-slip differential will replace the current locking center differential.
An air suspension system also will become available on the Sequoia.