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1 will be inlet when the solenoid is energized the lot should open letting air go to #2. It will close off the vent from #3. When off it closes 1 and connects 2 and 3 to exhaust

One port is inlet. One outlet. One is exhaust. Exhaust has to expell or the fan will stay pressurized

The allison uses a spacer between it and the bellhousing.

Remember A2 trucks the transmission sits almost a foot forward in the frame as an nhc250 truck does. Shifter placement could be fun Or a really bent shifter.

I posted it above https://www.ebay.com/itm/New-NOS-Vapor-Bus-International-Door-Lock-Solenoid-Pressure-Valve-24V-DC-/114425278534?_trksid=p2349624.m46890.l49292

Aneroid doesn't mess with fuel. It just allows fuel all the time rather than above 16lbs. I always adjust it first. You want thermal switch 993607. 205 on. 198 reset https://www.ebay.com/itm/HORTON-205-F-Thermal-Switch-993607-/303882440947?_trksid=p2349624.m46890.l49292

Solenoid https://www.ebay.com/itm/New-NOS-Vapor-Bus-International-Door-Lock-Solenoid-Pressure-Valve-24V-DC-/114425278534?_trksid=p2349624.m46890.l49292 Depending on which fan you have I can tell you which thermal switch you need. If your fan uses air to engage its a Normally closed type...

It's an A2 truck correct? Do you have the aneroid valve closed? Fuel turned up?

You wouldn't want to go below 5.81s with 395s tires and stock transmission and transfer case. It won't like low end off the start. You will be split shifting your transfer case to not be soo slow T1138 Transfer case OD is .73. Which is the same as most 10 and 13spds double od. The first Od...

They are out there. They aren't as common as they once were. And not all mack top loaders can swap over. I had a set of 4.88s at one time. I think @74M35A2 has the firetruck set which may be different You wouldn't want to go much below a 5.81 being that the transfer case on a 939 is a high...