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I tried to call SwampDonkey to thank him and tell him he needs to find better friends!!! I only have trucks that get one of a kind problems that are difficult to track down. New air dryer installed, problem still there. New governor installed, problem still there. What was the problem, the...

Installed new dryer today and exact same issue as before. Next stop, air governor. I somewhat got upset thinking I had thrown good money out the window for nothing but I thought better of it. I tried to replace the filter on the old one a few months ago and guess what? It is welded on with...

My new dryer will be here tomorrow thanks to member Suprman. Huge Kudos to him, he shipped it before payment was even sent. Perks of being a good boy on here I suppose and always doing right to others! I will install one of the newer variants that hooks up the same way. Since I knew I would...

I know I will get flamed for posting this but if your air dryer lets you down on your M939 series truck, you are done!!! I drove my M923 a few days ago without issue, tonight, it will not build air. I started it up, heard the compressor doing its job and boom, expello valve blew off like...