You can use some parts from a Gas truck
There's a good chance the condensor will be different, at least the intermediate mounting plates between it and the radiator support.
Hoses are likely different. The large Suction hose/short high pressure assemly is motor specific(Driver side and firewall), but the small high pressure side may be the same as Gas applications(passenger side.)
You'll probably need the evaporator core case cover and core gasket as it has the holes for the evaporator lines.
If your reusing parts, definitely get a new accumulator.
You won't need to do anything with the dash other than swapping in the AC equipped control head, make sure it is from a 1995-1997 truck.
There's a TSB about a change Ford did around 1994 with the valving to prevent a frosty windshield when the AC is on.
I did a swap into a van years ago and due to my finances reused everything with new o-rings and an accumulator. AC for around $200 total
Last edited by Jakey; 02-05-2012 at 08:08 AM.