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Our 1998 5.9L 4X4 SLT is just shy of 347,000. We are on our 2nd alternator and 2nd water pump. We also had to replace the radiator because we had a crack in the plastic. We just replaced the MAP sensor, throttle sensor, IAC, catalytic converter, and idle pulley which were all original parts (not at the same time but within the last 10,000 miles). We have also had to replace driver's side front wheel hub, passenger's front top ball joint, and tensioner pulley. Other than the normal maintenance (oil changes, tire rotation, belts, etc) we've had no major issues! We love our Durango!