Yes, the timing chain can and does eventually develop wear/fatigue after so many years and miles. Other components of the timing system (such as the tensioner and guides) also wear out (and in fact are more likely to wear out sooner than the timing chain itself). The OE timing guides are made of plastic, so they tend to wear out relatively quickly compared to the metal components. There also are gears as part of the system. If the truck has over 200,000 miles, and the timing components have never been replaced, I would recommend buying a timing kit which comes with all the necessary parts (chain, guides, tensioner, gears, seal, gaskets). You can get a good quality kit for about $100.
Chain
Only the V6 has a belt.
A 1979 Chevrolet pickup does not have a timing belt, it has a timing chain. The chain will last the life of the engine and is normally replaced during an engine overhaul.
Timing chain is usually replaced at 200K.
It has a chain, they should be replaced every 100,000 but I had an 1987 Toyota pickup with 230,000 and never replaced a thing on it and it ran like a dream. if your truck is running bad then replace it if not. then don't waste time
2003 Toyota Camry 2.4L does NOT have a timing belt. It does have a Timing chain which DOES NOT need to be replaced.
Timing chain usually needs to be replaced each 180-200K miles.
When was the last time the timing chain was replaced? I bought a 1991 Toyota pickup that had 190,000 miles and the original timing chain. Due to the high miles, the chain had stretched which caused a lot of slack in it. This slack allowed the chain to rub the timing chain cover causing a hairline hole/crack in it. Antifreeze leaked thru the crack and filled up the oil pan. Good luck... This is a typical sign that you may have blown a head gasket(s).
Toyota Camry 97 has a timing belt that should be replaced every 60,000 miles.
It has a timing belt that should be replaced every 90,000 miles.
It has a timing belt.
2006 corolla has a timing chain which does not have to ever be replaced.