It has a timing chain that should last the life of the engine.
You do not need to replace the timing chain because there is no timing belt at all on Ford Taurus. It has a timing chain.
The 1999 Ford Taurus does not have a timing belt. It has a chain that requires no maintenance.
In a 1999 Ford Taurus : The 3.0 liter " Vulcan " V6 engine has ( 1 timing CHAIN ) The 3.0 " Duratec " has ( 1 timing chain to each cylinder head , so there are 2 timing CHAINS )
it has a timing chain
timing chain
It has a timing chain that requires no maintenance.
timing CHAIN
timing chain
timing CHAIN
Chain.
Chain
chain.