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You may need a 1/2" m to 3/8" f bushing adapter as some air plus units use a 3/8 female. The AD9s are 1/2" If you didn't want a dryer you could put an alcohol can on the side of the engine. The navy/usmc trucks all had this over dryers. Alcohol just eats rubber

AD-9 dryers are common commercial dryers so most truck parts places have spare filters The pure air plus dryers used on the 5 tons have a bad habit of hanging the purge valve wide open even after new purge valves or rebuilds they still stick open. AD9s come with a 12v heater only so you have...

Depending on which dryer it has on it. It tends to be cheaper to replace the whole dryer unit than to replace the obsolete filters

It would depend on what is on your truck. 147x is more common. You can also bypass it if need be. Just crack your wet tank drain so it leaks a little bit and thr compressor won't over pressure the system to the 150 blow off valve

The overspeed is for the CTIS nothing else. Unplug the CTIS and drive at the speed you want. You have a bad pressure protection valve that is not letting air get to the air governor on the firewall Do your wipers or horn work? If no it's definitely a PPV

I'm sorry that you live in Miles City. I lived there a good many years working for Pat Roos. I don't miss any of it. Especially the 40 below with 60mph winds.