what is the cost to repair all the timing belts in vehicle?

The 2003 Ford Explorer engines are 4.0/4.6 or 5.0 and are all timing chains and do not use the timing belt set up. One of the 4.0 engines is a pushrod motor that uses a older style small chain and the others use the full chain from head to head. These are not replaced for maintenance. If there has been a problem it should be inspected first and see what repairs are needed to get it fixed in the most affordable way possible.