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Lemme look in my crystal ball. Ah yes, here we go. Sheriff's office draws the truck 10 years ago from 1033 program. Someone is driving it in the 4th of July parade when all of a sudden the shift controller shows error codes and it won't move. Towed to county barn, some inexperienced mechanic...

Are we talking about 20" wheels or 16.5 wheels?

Check the boost level, maybe the turbosupercharger is dragging a little. See if it spins freely.

LDS power. Known for rollin' coal. Make sure the air cleaner element is spotless.

You have some headaches ahead of you. Fortunately member Suprman here will have all the take out parts you need to fix your hangar queen.

Nope, that's why I hoard all the surplus ones I can find with broken glass and fix them.

Defective Korean parts. Send it back.

Now where would one find one of those?????

Yes, 1969 is when the order was placed and the first wreckers came of the line. Yours was one of them hint hint.

Most people that bob these put a M105 trailer bed on the back. You could cut out the front of the bed so the winch could remain. Hey if the 6 wheels and tires you are taking off are a waste product to you, put 'em on a pallet and ship to me, I'll pick up the tab.

Looks like a great truck. The battery wiring diagram is published here on this site. Make sure you do your battery connections properly, DON'T GUESS! The 31's don't fit very well but you can use them in a pinch. The military typically wrote the mileage on the oil filter at filter changes, my...

What is your registration number, should start with "NL" and be on the data plate or stenciled on the inside of the doors. 1987 date of delivery is wrong anyway, by then AM General was deep into manufacturing the 816's replacement, the 936 wrecker. MW Mules is correct, use the contract year...

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.