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What NDT said, Transmission doesn't interface with the air system. Reverse is a significantly lower ratio than the 2nd gear it shifts into when you go into drive. I am guessing you need to hold more brake pedal in reverse and this is forcing more air out a leak/making a leak worse... Since...

And the answer would be no...

No, I dont think we came to the same conclusion... From what you have posted, I concluded that you DO need to dig into the air actuator and you DO need to pull the wedge because I dont think you have yet seen that forward shoe move and it should move...:) look at any of the other brake shoes...

The wedge pushes between two rollers that spread apart. the rollers act as bearings between wedge and plunger. The rollers roll on the back of the plungers and push them outward as they are pushed outward. There may be a little slop in there that would allow one to move farther than the other...

Well with the brake drum off, you should be able to observe on the actuator end, that both brake shoes(pushed by their plungers)move equal distances when the brakes are applied. If this is not happening then you need to remove the air actuator and the wedge and inspect how the wedge and rollers...

Leaking axle seal, fitting or hose? Front or rear? On rear check the axle air vent line where it connects to a vent up on the frame. On the front, roll the wheel so the filler plug on the gear cover points up and remove it and activate the system. You are looking for air coming from that gear...

Yes PX33 connects to the VIM. My 98 is a WTEC II...

Chunks are bad, wonder what they came from? I assume you got them out of the bottom of the radiator when you drained it? since flow is from top to bottom they would have had to come thru the radiator to reach the bottom of the radiator. could be from a disintegrating coolant pipe coupling...

The pawl rides in the slot in the plunger. It keeps it aligned/keeps it from rotating and limits its overall travel Yes, pull the actuator and the wedge. Something is amiss if it wont push the forward plunger/shoe...

You should be able to see the state of the adjusters. You may be able to loosen the adjuster on the tight shoe to help you get the drum off... Good Luck!

3 of the 4 shoes on mine were installed backwards when I got it...

You said one of the two brake pads is stuck... Does the other one move when you step on the pedal? If so it sounds like the actuator that the wedge pushes on is stuck. Strip it down, they are simple, just big... Also make note that the shoes are installed correctly, the back plates are...

Transmission speed, not vehicle speed? Allison calls all the RPM sensors in the transmission speed sensors. That second code is for a pressure control issue. The OBD codes are meant to be generic, Alison may have a more specific definition assigned to them. Have you checked with them? What...

Tose look like shaft RPMs and tooth counts for the various make winches...

Well any winch cable feed rate varies with the number of layers of cable on the spool. This is especially true of a mechanical PTO winch. With a mechanical PTO there may be a combination where cable speed = vehicle speed but I would not expect that situation to last as you spool cable... An...

What Suprman said. Swaged on JIC fittings are going to be more robust in the long run...

Exactly what idea are we talking about?

Well that is an OBD II code, but how are you getting vehicle speed sensor from that? P0734 Symptoms Check Engine Light will illuminate Vehicle will not shift properly Decrease in fuel economy In unusual cases, there are no adverse conditions noticed by the driver In some cases, there may be...

Scott Air applied at the front emergency gladhand overrides/bypasses the park control and injects air to the park chambers via the second leg of a 2-way check, circled in red on this drawing.. .

Yea, something to make it more operator proof, to prevent say attempting to drive in the direction opposite winching direction. Or it was something specced by Allison to keep from possibly overloading the trans/engine with drive and PTO outputs simultaneously...