i did the belt, water pump, and tensioners in my wife's concorde with a 3.5 at 104k [and change]
i was surprised to find the original belt "looked" fine, but one of the tensioners [the only one ? i really forget] was starting to get a roughness in the bearing.
i think i got it just in time.
and for whatever it's worth, this car was a long trip, maintenance done as required, not beat on, vehicle.