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at what mileage do you change a 99 Chevy Tahoe timing chain.
chain
The 2003 Chevy Tahoe (both the 4.8 and 5.3L engines) have a timing chain, not a belt.
It has a timing chain and gears. NO timing belt.
It has a timing chain.
It has a timing chain and gears. NO BELT.
First of all, It has a timing chain not a timing belt. No need to change the timing chain and gears. They will last the life of the engine.
It has timing chain and gears. NO belt.
It is not necessary to change the timing chain. It should last way over 100,000 miles. Timing belt should be change at least at 90,000 miles or earlier as listed in your owner's manual.
don't replace it unless it breaks
1996 Chevy blazer timing chain
You don't. The Chevrolet Tahoe does not have a timing belt. It has a chain which requires no scheduled replacement.