On a 1996 Ford Taurus :
The 3.0 liter " Vulcan " V6 engine , which is an OHV / pushrod style engine has
( one timing CHAIN )
The 3.0 liter " Duratec " DOHC , V6 engine has ( two timing CHAINS , one chain to each cylinder head )
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.
timing chain
timing CHAIN
timing chain
timing CHAIN
Chain.
Chain
Chain
chain.
The Ford Taurus does not have a timing belt, it has a timing chain. The timing chain is designed to last the life of the engine, and does not need routine replacement.
It has a timing CHAIN
The 1999 Ford Taurus does not have a timing belt. It has a chain that requires no maintenance.