Technically 105K miles - but most belt manufacturers recommend between 60K - 70k miles. I would go with the belt maker over Chryslers recommendation.
Change it at 90,000 miles.
If it has high mileage, it could be the timing belt at fault.
Car makers do recommend replacing the timing belt according to mileage in order to help prevent it breaking, which will cause major problems with your vehicle. Honda recommends replacement somewhere between 60,000 and 105,000 miles depending on the size of the engine. You should have it checked regularly even before reaching the mileage.
There is no scheduled mileage or time mentioned in any manual for Timing Chain replacement.
Factory recommended replacement mileage is: 105,000 miles.
90,000 Should be the correct replacement mileage
timing CHAINAdded: Check the above answer out carefully - I have an '04 and my engine has a timing BELT. Recommended replacement mileage for the belt is 90,000 miles.
There is no timing belt - Windstar engines all have a timing chain. No routine, mileage based replacement required. See "Related Questions" below for more
diagram for timing marks on 1996 dodge intrepid 3.5
Timing chain.
has a timing chain
The current factory recommended replacement mileage is 105,000 miles.