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Sorry, I did not catch that. If you can get both shifters into the detents smoothly, then it is something in between. Either the cascade box is fragged, or the high/low shift is in an intermediate positions that doesn't exist. Were you doing anything when the problem appeared, or did it just happen one day? If I understand correctly, the cascade has helical cut gears and will generate a lot of thrust loads if used to pull/push heavy loads. The Cascade box is for speed reduction, not stump pulling torque. Think of FluFarms snowblower where he wants to travel slowly at high engine RPM.
What's the NSN and part number ?
Maybe I am miss reading something here, but as I understand it the transmission is in direct or high when operated normally and the air shifter lowers the gear ratio. In other words the air shifter is an under drive not an overdrive. If one were to drive the truck without waiting for air pressure to develop to the point where the air shifter would work, you’d simply be driving around in direct ratios. Am I somehow wrong in this understanding? Not knowing the details of the intricacies in that mechanism I’m speaking off-the-cuff, but it’s probably spring loaded right? So the shift collar is held in direct range when air pressure isn’t delivered to that actuator, thus if the suspect is the air shift system perhaps it’s a broken spring? Anything else broken that would cause these symptoms in my mind would make a loud scary noise.
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