First, you have to define "hard". Nothing is hard with the right tools, the right amount of patience and the right amount of time. Do the math, measure an F-150 frame and measure a Ranger frame. I don't know why you would want to do this but I've learned to not question others ideas. If you're looking for V8 power it would be much easier to convert a Ranger to a 302 with all of the parts out there to do so. The 150 still has the crappy twin I beam front crap suspension (my opinion that there is no comparison to a solid axle)