2002 Ford Explorer XLT 4x2 we bought as a Program Vehicle. Had every option practically, except V8 and 4x4. Had the 4.0 V6, that rattled worse than a Cummins diesel. I could change the oil, get about 2 weeks of quietness, then back to rattling. Had the HD trailering package, which included 3.73LS. That rearend would howl above 45 mph. TSB stated some where built with incorrect gear lash. Both rear window power regulators died; I replaced them myself and noticed the service package replacement parts were a lot beefier. "Lifetime" lubed ball joints on both sides had their boots dry rot / fail, where crap could get into the ball joints. A $10 or so 1-2 shift solenoid crapped out in the transmission, which required a complete transmission valve body assembly. I spent over $3000 on these and other repairs the 4 years we had it, repairs that didn't happen before or since with other vehicles we've owned.