Inside the front of the engine.
The Chrysler Concorde has a timing chain, which is supposed to require no changes, however there have been problems with the 2.7 liter V6 timing chain which would ultimately destroy the engine.
go to www.enginebuildermag.com/.../timing_chain_installation_procedures_on_19982002_chrysler_27l_dohc_engines.aspx - It has diagram & instructionsThe marks on the sprockets line up with plated links on the chain.
The 3.3 liter V6 has a timing CHAIN and the 2.4 liter , 4 cylinder , has a timing BELT
Your 3.8 liter V6 has a timing CHAIN
The 3.3 Liter Chrysler V6 has a timing chain.
It is on the front driver side of the timing cover.
The 3.8 liter V6 engine in a 2006 Chrysler Town and Country van has a timing CHAIN
That engine uses a timing belt.
This is the Mopar part number 4663598
belt
In a 2003 Chrysler Town and Country : Both the 3.3 and the 3.8 liter V6 engines have a timing CHAIN
The 3.5 liter V6 engine has a timing BELT , the rest of the engine sizes have a timing CHAIN