Originally Posted by KJRitchie
Toyota recommends 90k or a certain number of years which ever comes first. If the timing belt fails the engine is ruined. The Tundra has a different design and doesn't require the same maintenance.
The 4.7L V8 is an interference engine so you don't want to take a chance on a belt breaking. 90K or 9 years, whichever comes first. It would definitely be expensive. The 4.7L was used in the 03-05 4Runner. Not sure if the 06 had a V8. The Tundra uses the same 4.7L. They are all interference engines so you should follow the required maintenance schedule. Please see attachment for the 2006 Tundra 4.7L V8
You can use the tool at the Gates site to see if your engine is interference.
Auto Parts Interchange | Gates Corporation
Select the application button, then choose Passenger cars and Light Trucks and fill in the rest of the boxes for your vehicle