What do I need to convert? New Motor! 79

 

You will need the R134a fittings for the York compressor to attach the hoses (14.99 each from Nostalgia Air, or look on ebay).

http://www.nostalgicairparts.com/ac/...ittings-42.php

Then you just need to have the system evacuated to get all the old moisture and particles out and then recharged. A new dryer is highly recommended and also you should replace all the old O'rings in the hoses to the green O'rings for R134a. I think that's it.

 

What buck said. When I did the Bronco I got the fittings, evac'd the system and charged it. It still blows ice cold today.