Yes
Chain.
You don't, that's why timing belts and chains are replaced with certain mileage intervals regardless.
timing chain
Chain
Chain.
yes
The 2003 Dodge Durango has 16 valves.
The 2003 Dodge Durango has a V8 engine.
Timing belt.
chain
It's on the crankshaft behind the timing chains.
2.4L has a belt 3.3L has a chain 3.8L has a chain