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So much this. I wish Bryce had pursued his air locker quest at the manufacture level.

Yes, the army never spec'ed them and it would have been nice. As far as I know the lockers available are not air or e-lockers (they are "locked") . Most folks only slap on in the rear unless the truck is full-time off-road because lockers will cause you outboard wheel to "skip" in a tight...

https://tfsweb.tamu.edu/uploadedFiles/TFSMain/Preparing_for_Wildfires/Fire_Department_Programs/Career_Fire_Department_Programs/Firefighter_Property_Program/TM-9-2320-365-10%20Operators%20Manual%20M1078%20series%202,5%20ton%204x4.pdf

Don't have it on me and I'd hate to tell you wrong info. But you can screw the truck up if you don't follow the procedures/restrictions on Mode use (ie: not a good idea to slap it into mode going down the highway, etc).

And these trucks are not really 4x4. They are technically more along the lines of AWD. Pity they didn't see fit to incorporate lockers and give the trucks actual four-wheel locking capability

Button on the trans control. BUT...there are a number of restrictions. It's in the truck operator's manual. Do you have that TM?