No, not unless it is worn out. Timing chains normally last the life of the engine and are replaced when the engine is rebuilt.
Your 2001 Dodge Ram does not have a timing belt, it has a timing chain. No replacement is necessary.
The 1990 Buick Century has a timing chain and not a belt. No replacement is necessary.
You never need to replace the timing chain if the engin use timing chain(not timing belt).
The 2004 Toyota Corolla has a Timing Chain and not a belt. No replacement is necessary.
1998 and up 4 cylinders have timing chains not belts, which means it is not necessary to replace.
right in front of the crankshaft pulley beside the oil filter....is the timing chain cover(two timing chain...#1 on the crankshaft sprocket, #2 on the cam sprocket. Need to lower the engine to access the timing chain. Timing chain, not necessary to be replace, unless they broke loose.Other than that it remain with the life of the van.
How to replace a 1985 Chev Suburban's timing chain
How do you replace the timing chain on a 1994 mercury grand marquis
The 1990 Buick Century has a timing chain and not a belt. No replacement is necessary. these cars run forever the chain and pulleys need replaced around 200k
No, You do not need to remove the oil pan to replace the timing chain. I don't know why you think the timing chain needs replaced. But I would make Darn sure that it does before you tear it down and do all that work for nothing. The timing chains on todays engine normally will out last the engine.
if its a chain^
It is not necessary to change timing gears when changing a timing chain unless they have become worn. You won't know if this is the case until you get the cover off and inspect them. It is necessary to change any chain tensioners when you change your timing chain.