Go to gates.com web site for info on timing belts for '04 - '06 Toyota Tundra trucks. My '01 Sequoia has a timing belt. I got it changed before it broke at the 90K miles as recommended by Toyota.
In the gates site it will tell you if the motor has a belt or not. It also tells you if it is an “interference” motor or not.
An interference motor suffers extensive damage if a belt breaks. Valves collide with pistons, breaking and bending values, breaking pistons, damage to head, and cylinder walls in block can also occur. Repairs will cost several thousand dollars, sometimes it means a change of motors.
A non-interference motor just stops running suddenly, but isn’t locked up. There is no damage to valves and pistons. Repairs costs are for a new belt, and other items such as a water pump and tensioner which are often replaced with a timing belt; about $600. Other costs are the tow, and any damage due the stopping whereever you happen to be when the belt lets go; ie in the passing lanes of a busy bridge with no place to pull over.