Eaton 18 speed slave valve leaking air from vent

I have iPhone 7 and connected to WiFi but for some reason it’s acting silly when I click on literature. Where are you seeing where to type vin? Last 6 is 586680.
It’s original trans

 

Yup. But it from the landscape company. Thank you sir. Got the manuals to open.
Can’t thank you guys enough.
Always wondered stock hp also. Paid 1k to have the motor turned up too. So I wander what it has now. Boost went from 22psi to 30

 

peterbilt didn’t have the part in stock today. Work canceled do to the rain so I drove the truck 15 minutes down the road to the local truck transmission and rear shop. They specialize basically in Eaton transmission. He threw on the new parts in like 15 minutes and charged me a hundred bucks. He tells me the reason why my high and low range is acting up sometimes becuase the synchros are wore out. Said it would be about 2 grand to fix. Trans stays in the truck and they just remove the rear section. I’m not gonna mess with it right now. I have a hard time believing it’s the synchros when it’s not grinding at all using the range selector going from 4th to 5th or 5th back to fourth. It’s just sometimes slow or weak. If you preselect while in 4th and then go to hit 5th gear, you don’t hear it drop to the range until the shifter touches that gear. It’s a 18 speed so I’m not talking about the side splitter button that you use your thumb to move. Talking about the bigger switch.

 

Thank you for the reply. I have read a few of your posts thumbing through the forums. You seem like a pretty knowledgeable guy in all aspects. I was reading there is one more possible culprit. I think it’s a slave valve on side of trans. Is that what you are referring to? Looks like air hoses go from there to the regulator. Even if it is the synchros, i have no choose but to just keep driving the truck till it gets stuck in one range.

 

Also, I have been playing with range selector with truck off so I can listen for an abnormalities. Haven’t heard any gurgling sounds. Range selector works fine in neutral with truck off.

 

Can you tell me which line buddy?