Here is the story. The truck is a 2000 Dodge Durango 4.7L V-8 Yesterday the engine started knocking on the bottom by the oilpan big time, so I asked my friend who happens to own a mechanic shop and the still can't diagnose the problem without removing the oilpan and taking apart alot of the motor. They called it a bottom knock. I really don't want to spend 2000-5000 on repairs or on a new motor. Does anyone have any idea what the problem could be. the engine is not missing, and the truck runs fine. Could it be some kind of bearing problem?? Need some help.