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On most trucks with a front emergency glad hand, there is a single tube that feeds the air tanks through a check valve. On the FMTVs, there is a second tube connected to the emergency glad hand that leads to an unknown (until now) location. Looks like it's connected to the spring brake release...

Sounds like this is your answer. Your truck is self-charging the emergency front connection due to the check valve not closing. I don't recall the spring brakes auto-releasing whenever I have flat towed FMTVs but that's not to say they don't.

Symptoms point to the anti-compounding relay valve stuck such that air can freely flow to the spring brake chambers regardless of what the dash valve is commanding it to do. I know you said you replaced it. That is what is confusing. Could the replacement be stuck as well? Not likely.

Ok, just so I'm clear on the symptoms: with zero air pressure in the tanks, the spring brakes are engaged. Then, if you start the engine, as air builds, the spring brakes release REGARDLESS of the position of the dash parking brake control?

Maybe the check valve behind the front bumper has rust and is frozen open. I did a thread on replacing it. Kinda hard to work through the bumper openings. My thread...

Guys, thats the value of Vertread, they have vetted their subs and the bad apples are weeded out. Who has time to spend all day on internet load boards looking for trucks? If I get fired from my day job for spending all day on the internet, I will wish I spent $100 on a broker.

If you put 635 hp through the T1138 transfer case there will be pieces of it all over the place.

If you pull your meter and your power utility finds out about it you are in for a long azz chewing. If you have a "smart meter" they will know immediately.

Looks good, what is the number under "US AIR FORCE"? The two digit number is the year the truck was acquired by the Air Force. What does the dash data plate say? Could have been a fire truck or line repair truck V17A-MTQ, but is the M34 type single wheel chassis like you say.

The 820 is like a 602 that grew up. Same OHV configuration. I believe that your crash truck is the only military vehicular use of that engine. I'm sure the engine had numerous civilian applications.

Yup he had dozens, each painted a different color to identify the trade that used it.

Splitting that transfer open and repairing it is very difficult. Most people just find a good takeout. That engine is 820 cubic inches and I think 300 hp.

Sam Werner, now passed on, of Tracy City TN told me those were made by the TVA so the trailers could be used for tools.

You are correct, the O11A used the T138 transfer, same as military 5 tons 1950 to 1980. If you do not have power going through it with high or low range firmly engaged, something is wrong inside and internal repair is required. The air cylinders control the engagement of the front axle. Does...

They came with AMC 304 V8's as an option.

The Crismon military vehicles book documents CJ-5s used as rear echelon support vehicles.

Bikeman, is there enough room to reach over the seat and fiddle with the straps holding the tools being as how the seat does not fold forward in the Dodges?

880s never had 'em. Was on Chevy's to do list though!

Caiman MRAP wheel will work on FMTVs, just need 40 rather pricy special lug nuts. (Thread here on this) These wheels have not been sold gov't surplus that I know of, they came from the two scrapyards that cut up BAE's stock of undelivered Caimans after the drawdown.

You guessed wrong.