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Truth is, you almost never need to use the low gear. It is only for pulling something very heavy that is stuck. Such as a stuck forklift or some such. It is not really for any kind of driving. Just do not use low gear and you will not accidentally reverse in low gear.

OK, so I should turn my tire but look at driveshaft. Thanks a lot.

Thanks. So, in a good, normal case, with air pressure, I should see: 1) Engage off -- tire and shaft turn easily 2) Engage on -- tire and shaft cannot be turned by hand If the switch is plumbed improperly, the tire and shaft should not turn by hand regardless of the engage switch position. Right?

I would like to test my M939 series trucks for this condition of all wheel drive being engaged at all times. I did see that I need to jack up the front (easy, I have a forklift), but I am not sure what exactly would be the test to perform once the front wheels are up in the air.