I did most of this swap but never finished it on my 93. You will have to look at the schematic to see if your truck is wired for it or not. Mine was. You can look in the power distribution box to see if the wires go to where the a/c relay is supposed to go.
Other than that you will need the evap coil/a/c box, accumulator, suction and discharge hoses, condenser, a/c ready hvac control, compressor, and a/c wiring harness. I believe the harness plugs into the large square gray connector under your steering shaft and goes across the top of the engine. It should just plug in from that point. I got most of my stuff off an explorer. It would be expensive to buy each part separately, but if you can find a donor that is the way to go.