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The button should not kill your hydraulics at all. The truck running at rpm gives the wrecker its 2200 to 2500psi which is the power of the crane. Rpm speed increases flow gpm and gives you speed of the unit.

Under the truck. Drivers side. Right behind the air filter on the inside of the frame. There is a 4 or 6 way block there that has 1 large line going going the intake pipe. This is the vent connection block. Remove 1 line at a time from the one side or the other to see which one is dumping that...

It engages the spring brakes override the parking brake handle linear valve that dumps the air to the brakes. This also overrides the Spring brake override button on the dash. However Some trucks were equipped with a brake override switch under the steering wheel. That was used for self...

You just need to connect two lines together to bypass the whole solenoid and auto 6x6 in low range..

You do the line union connection to bypass the solenoid or just capped the line going to the solenoid?

Use a stethoscope or drive extension. High by the pto and pump or down medium lower? Could be a rattling shift fork in neutral If it was a truck under that a wrecker you could atleast get the inspection plate off the top and try to pinpoint it

Does it do the chatter if you engage the front winch pto? Just trying to localize if it's a transmission or a transfer case. The noises radiate on these trucks.