You should be concerned about the t-case detonating. My buddy had an '04 that had faulty module which tried to shift into 4hi/lo at 80 mph. Cost him a new transfer case and a pair of underwear
2000 2500 with 258,000 miles. Cold-knocked since I got it in '04 with 114,000. I always wait until the knock quiets down before taking off. Oil changes between 3-4,000. Leaks about a quart every 3,000 from the oil pan gasket.
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