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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
"Clicking" sounds during turns is a classic symptom of bad cv joints. Your independent rear suspension Explorer has CV axles in the rear, as well as the front, so check those.
The 3rd gen Explorers are also notorious for bad rear wheel bearings. Jack the rear wheels off the ground, and give them a good shake. If there is any wobble, you need wheel bearings.
Well, going uphill, I would assume you are trying to maintain speed, thereby putting the cv joints under load. So, it could be. Again, same with the wheel bearings.