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TRUCK HAS A CHAIN THAT SHOULD LAST THE LIFE OF THE TRUCK. I don't believe that these engines are equipped with a "timing belt" like some Japanese & European cars, but a conventional timing chain as used by American manufacturers for many years. Timing chains do not need to be periodically replaced as with timing belts, except at engine overhaul which should at 150,000-200,000 miles or greater on today's engines if serviced & maintained properly. GM V-8s have timing chains as far as I know; expect to change around 50 to 70k miles is traditonal wisdom.

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Q: When would it be time to change the timing belt on a 2001 GMC Yukon XL?
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