I have a 2003 ford explorer limited awd 4.6and wanna make it 4x4 what do i have to do to do that

Keown

Transmission 

Mr_Shiftright

You'd need to buy another vehicle in that case, as you would spend so much money on a new drivetrain, fabrication, welding, wiring and control that you could probably by a new Explorer by the time you were done trying to do this.

ANYTHING can be done to a car with enough money and skill, so the question is a) do you have the money and skill and b) does it makes any sense to do it?