9 speed Eaton won't shift into low range?

Air slave is working, air plunger on the rear of the case that's behind the 4 bolt cover is working with a good o ring, i actually pulled the transmission yesterday and am gonna replace it today with another one from my parts truck. Thanks Although I may tear it apart to learn what happened first. I have nothing to lose.

 

Did you ever find out what the problem was? I’m have the same issue with my Eaton 8 speed. Does not move from 1-4, but works great 5-8. Please let me know what you found

 

Please let me know what you found with your 9 speed.
Did you ever find out what the problem was? I’m have the same issue with my Eaton 8 speed. Does not move from 1-4, but works great 5-8. Please let me know what you found

 

I have a problem with my 10 speed fuller.
It splits into hi but would not split down until the truck is at a stand still.
Valves are working fine and has good air. Could it be the friction clutch?