Losing air pressure when put into reverse (M817)

[Rebar]

Sorry about this mundane question, but every time that I shift the M817 into reverse I get the expected little puff of air escape, but every now and then, it is a massive flood of air that continues until I shift out of reverse. Then the next time it is just fine. Weird. None of the other gears do this. What am I doing wrong here?

Thanks for your help here. Trying hard to be worthy of this totally most excellent truck...

Rebar

 

[swbradley1]

Could be the air valve for reverse is leaking. My old 818 did and I never fixed it. Use search as there are threads that cover that valve.

 

[73m819]

Either the reverse air valve on the trans OR the shift cylindler on the xcase

 

[swbradley1]

Ron has had one longer......

thx Ron

 

[Floridianson]

Transfer case air sprag engagement cylinder.