Remove the drain plug on the bottom of the oil pan and drain it. Don't re-install plug until it stops dripping. Look at the plug, is the gasket okay? is the head of the bolt worn? If so replace as...
It is driven by the nose of the crank shaft.
Mounted on the engine block inside the oil pan.
inside the oil pan take the oil pan off and there it will be bolted to th engine
An oil pump for a Dodge Ram 2010 3500 cost: $111.20!!!