Has anyone used a vintage air system on a 84 Ram ?

I drive my 2 wheel drive all summer, Just wondering what it would take to put AC in.

I have an 85. Between a junkyard or 2, and our own Rhinodart, I got all the pieces to put "factory" air into my truck. Only thing I might be missing and any "figuring out" to do might be the wiring.
The old stuff is out, I am doing a little bit of bodywork on my truck (Not on account of adding the factory AC pieces in place of the non ac stuff) before I put the "factory AC" pieces back in. Cost wise I'm gonna wind up with way less in this swap than any "vintage air" type deal
As it turns out I'm gonna have a few leftovers including 2 "factory AC" dashes

I installed factory air in my '83. Inside the firewall I used parts from an '89 truck with AC. Under the hood I converted to a later compressor.

Anything special about the under hood wiring? That's the only part I haven't figured out yet.
And while the dash is out anyway now's the time to address that.

I've wondered about this swap also. Any idea on how many hours of time is involved in swapping a "factory A/C" set-up into a truck without factory air? (I don't need an exact number, a "ball park" estimate is good enough!)

A complete truck swap from non-AC to AC using factory parts may take longer then most expect.

The heater box and all the heater controls have to be swapped. You have to add the AC duct work to the dash, or it needs to be changed as well. The AC compressor and the associated belt drive system needs to the changed. You need to add the AC condenser out in front of the radiator, and that may also require a larger radiator. The most likely fan and its shroud can be added with the drive belt assembly part of the operation with minimal extra time. Then there are the AC hoses and their needed components (expansion valve and receiver/dryer) that the hoses require be add to the arrangement. Back in the early 70s when shop rates were in the $30/hour range, adding AC where it was not before had a $500-$600 labor bill + the parts and components needed.

If the truck is a project that is still pretty much a pile of pieces, then its pretty much putting the AC pieces in place of the non-AC pieces, and the labor time doesn't add up to much.

If a hang on unit is available, it might be a less effort and less cost option, unless you have a donor truck with a functioning AC system.

I haven't done a complete non-a/c to factory a/c swap but both my '71 Sweptline and my wife's '79 LRE were factory a/c trucks with ALL of the underwood components missing. For each one, I found a junkyard donor for brackets and pulleys from a later model with the Sanden-style rotary compressor, ordered all of the new components from Rock Auto or Amazon, and bolted it together. The '79 was pretty easy for lines as I just got parts for an '88. For the '71, I ordered the correct lines for both a '71 AND a, '88 and had the local a/c shop cut and splice them where I'd marked. Both were getting a cam and manifold change at the same time, so there was minimal additional work.

Where do you get the bracketry to mount the radial compressor on a big block?

Bouchillon used to, don't know if they still do

https://www.bouchillonperformance.com/inc/sdetail/467/567