for $4,500 there most be something wrong the engine might be going bad or the transmission or the car. Do a car report maybe the car was a hurricane floods , But for this prices is good I can not believe it , Check if the car have salvage title or had been in a crash check all this things before buying you dont want a lemon! The Durango also have problem with the steering wheel such as rack pinion, ball joint, tie rod and all of those stuff!
But if I was you I get the Durango right now, good luck!