Need more info on this, 4X4? Engine 4.6 or 5.4? I don't know your auto experience but on a 4.6 you have to take off the timing chain and oil pan. You have lots of work ahead of you or big bucks at a repair shop. Basically it is behind the crankshaft pulley. Both engine are similar in removal. 4X4 just makes it harder.
Why to you think you need a oil pump anyway?
