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Yep different fire walls
2 hole non-AC fire wall
3 hole AC fire wall
3 hole over the top of the 2 hole fire wall
As Cory said you need to cut that bigger hole and a few others for bolts IIRC.
I went with swapping the fire walls and cut the 2 hole out and welded in the 3 hole.
Not everyone can do what I did be it skill, tools and parts. I had a AC truck that all the cab parts came from.
As said you will need the dash, duct work and HVAC controls from a AC truck and that will bolt into your cab.
As for the wiring this is an add on harness. Non-AC harness just plugs the blower motor together.
The AC harness goes between that plug and then out through the fire wall to the blower motor & compressor.
Oh you will also need the HVAC box both inside the cab and engine bay side.
Here is the engine bay side less the compressor, did not have it yet and also found had the wrong water pump pulley.
The condenser you can get new dose not fit with out a little modding, just some spacers mostly.
Dave ----
Thanks for posting this. I haven't been able to find concrete answers on the firewall differences between a/c and non-a/c cabs. I'm less scared of my cab swap now!
What I did was a little extreme and if you don't have the tools or skill I would say cut the needed holes to fit the AC box to the non-AC fire wall.
That was one of the first things I did when I first joined, no one knew what skills I had and kept telling me just cut the 3rd hole!
Well as you can see I did not listen and did the firewall swap. I am happy on the way it turned out and unless you look really really close I don't think you could tell it was a non-AC truck.
Dave ----
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