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You nailed it! It doesn’t guarantee your t case to live, but it does remove some stress. I bypassed my sticky t case air actuated interlock and although I didn’t hesitate to backup in low gently, I wanted to be able to easily shift back and forth from low to high with zero issues. Be advised...

@tobyS have you removed the large washer that engages the front axle by default when in low? Sent from my iPhone using Tapatalk

That I am aware of, it is only a problem with M939 series trucks equipped with the Allison because of the reverse gear ratio and torque multiplication combined causes the gears to attempt to climb themselves under a load and push the case apart. In theory, we could create something like the...