Timing chains and gears USED to be lifetime items,after the 60s. My boy just paid over 4 grand to get his Mustang engine pulled, when his rear timing gear CASSETTE failed.
He lives in Columbus, 85 miles away, or I woulda fixed it for him and saved a lot of money.
As it was, they hadn't told him to replace the oil filter directly after driving it a few miles. I made sure he replaced the oil filter immediately, since as hard as they try, they can never get all the debris out after parts fly apart.
It's running great now. Hope it holds up.