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If you have A1's you MUST have a laptop with diagnostic software or a J1939/J1708 scan tool. Without being able to look at computer I/O you can be left with ZERO ability to diagnose a problem. A good example is the boost pressure transducer - that can get "stuck" at 0 psi (it's normal state when...

Oh you mean TM's. Private message me. Those aren't public domain and they aren't simple documents. The A1+ trucks require the military digital reader software and have a high level of diagnostic integration. Totally different.

All the FMTV's use the same radiator. A0, A1, A1R - heck I think the A1P2 is the same also.

S&S or the military or both deleted that on later trucks - I assume the ABS make it irrelevant or possibly it interferes with it's operation. If it's not the ABS then perhaps there is some other magic that could be adapted to older trucks? I'm far from an air brake system specialist but may be...

Are you missing the wiring diagram under the battery box cover?

The wheel valve and hose weighs 11.5 ounces. Additionally the TM work package for tire mounting make no mention of this alignment. Third - Goodyear says the tires don't require balancing. This has been consistent with my experience. The beadlock hardware is probably 2 ounces at most (it's 4...

Since the park/emergency controls are a single unit on the newer trucks and are fed from both primary and secondary supply - perhaps the 2-way function is actually inside the control valve assembly? I just remembered that the older trucks have two separate valves while the newer trucks have a...

It is likely the case that I still have cold-induced leaks somewhere. Just not at the moment with 80 degree weather. For sure the dryer casting issue was causing a leak-down of the wet tank though. Fixing that is helping to improve the situation. It's obviously not the last leak. But the tanks...

The park/emergency controls are supplied by T fittings that also supply the pressure transducers in the MMDC on the passenger side of the treadle valve where there are pass-through supply side ports on the valve: There are no 2-way valves that I can find under the dash though.

Ok so I did confirm that the AOP supply is coming from the two-way valve off the side of the anti-comp valve and that 2-way is indeed controlled by the park control air. So my marked up pictures above are correct. I chocked the wheels and disengaged the park diaphragms (found leaking fittings at...

Negative. My truck is not "floaty". Even at 80 mph. I can let go of the wheel at freeway speed and the truck drives perfectly straight. Different tires of course....... no run flats in mine either.

You don't think the valve that's off the elbow of the anti-comp valve park air inlet is a three way for the AOP supply? Or is that not park air coming into it.... damn I need to trace the line to the hydraulic panel. I'm going to disconnect it at the panel see which line it is in the back.

Steering related? I doubt that. Your truck has fewer miles on it than mine had when I purchased it. All the drag link and tie rod boots were shot but the joints were TIGHT. I cleaned them all out, packed with new grease, and installed Energy Suspension urethane boots. Downstream of the steering...

It probably would never happen, and the reason is simple - the vast majority of the time you are either replacing a single part at a time, or replacing one line at a time - part fails or line fails, etc. And in the military if you forget what went where you just go look at another truck in the...

It would appear that my A1R is plumbed how you are suggesting. I don't have the load valve but my anti-comp valve is T'd into the primary treadle valve supply for the relay valve below it and I have no secondary treadle valve supply T at the brake protection valve.

Yeah - try swapping your spare to one of the front wheels and if that does nothing try it on the other side. I've never experienced anything like that on my same model truck. I have 20k miles on mine. Running MV/T's with '22 date codes. What date code are your new tires?

Wheel hop? Can you take a video? Not sure what you are describing. Vibration? Is it speed dependent?

The line from the hydraulic control panel is coming from the back of the truck. Looks like it's coming from a 2 way check valve off the side of the inversion valve? One port on the three way (?) is T'd into the park valve air line coming into the inversion valve.....

Well that is the newest diagram I can find. Indeed the dryer discharge is not T'd off to the tanks. It goes through the wet tank and the only thing T'd to that is a 3/8" line..... I guess that's "TO DRESSED ENGINE" - whatever that means. That line is in the bundle of lines going toward the front...

What are you thinking they could assist us with?