Since I had to pull the timing chain cover to get at a broken water pump bolt I think it's probably a good idea to replace the timing gears/chain.
It just measures outside the 1/2" of deflection (slack vs taught) and the engine has over 110,000 miles.
I've noticed a "chatter" when the truck is climbing a hill. Will replacing the timing chain help reduce/fix the chatter?
It depends on what the source of the chatter is. In my experience noisy chains are most noticable at an idle.
I usually associate that rattle under load as a timing ping or knock. You can adjust the timing slightly or use higher octane gas to stop it.
Chains don't wear out too often. They usually last until a rebuild is needed.
Mike
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