No, the 3.5L uses a belt.
Timing belt.
The 3.5L has a timing belt.
Belt
It has a belt.
The 3.5 litre V6 engine in a 2002 Chrysler 300M has a timing BELT
Gates ( they make timing belts etc. ) lists a TIMING BELT for the 3.5 L - V6 engine in a 2004 Chrysler 300M
Timing is computer controlled and is not adjustable.
For your Chrysler 300M, you can expect to pay around $800 to repair your timing belt. You will be paying more for labor charge than for anything.
Timing Chain
timing chain timing chain
To install the timing chain tensioner on a 2003 Chrysler 300M, first ensure the engine is at top dead center (TDC) on the compression stroke. Remove any components obstructing access to the timing chain cover. Install the new tensioner in its designated location, ensuring it aligns correctly with the timing chain, and then torque it to the manufacturer's specifications. Finally, reassemble any removed components and check for proper operation before starting the engine.
timing chain timing chain