One problem related to power train driveline has been reported for the 2004 Toyota Tundra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Tundra based on all problems reported for the 2004 Tundra.
2004 Toyota Tundra leaks gear oil from rear differential cover plate. Cover plate is so thin a pin hole developed. Cover plate is pressed on so in order to correct problem, a whole new rear axle is needed according to dealer. When I brought truck into dealer, dealer told me he seen 6 of these like this already. Metal plate is too thin and doesn't hold up to winters in new york and is rusting out due to metal being too thin. Cost for repair is $3500 . When I contacted Toyota, they just said there isn't any recalls on this subject yet. They did recall Toyota tacomas due to rust eating out the frames but no recalls on rear differential cover plate. If gear oil for rear differential leaks out, due to metal fatigue, truck is not drivable and heat caused by friction of gears could cause a fire.