You don't even have to crawl under the truck to do that!
If you have a shift lever on the floor-NP271, electric knob-NP273..............both take ATF+4 as noted above, or throw some 75w90 gear oil in that puppy!
Not sure that is the best idea. GL5 gear oil is fortified with extreme pressure additives, for use in high speed/high torque automotive gearboxes. A transfer case doesn't have extreme pressure gear meshing under torque, its made up of planetary gears and roller bearings which is why ATF is almost always specified.
If my electric controller freezes up just once I'll be calling with not so nice of words. asking the how too's.. cuz I know it's gonna get ice build up one day...[emoji12]
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