does a toyota tundra 2008 4.7 liter trd automatic have a chain or belt

It has a Belt...4.7L Engine Recommended replacement 90,000 miles, normal driving conditions; Water pump driven by timing belt. It is recommended that you consider changing the water pump and components when replacing the belt.. You can buy the Complete Kit w/seals at Rockauto.com for $199.79+$13.99 shipping=$213.78 NO SALES TAX....google Part Number WP298K1AS for a picture of the Timing Belt, Water Pump & Component Kit.... Local parts store is around $300.00 for exact same parts,made by same exact manufacture,DAYCO!