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All your temps look fine. Ah, the voluntary wardrobe malfunction. Something about Army trucks. I've enjoyed that twice over the years.

I think trying to get the 395s balanced is a hopeless endeavor especially over the thanksgiving weekend. Army never did, Stewart & Stevenson never did either.

YES!!!! Inter (between) Axle Differential. All modern 18 wheelers have it and a pneumatic lockout on the dash to control it. MTV has it but engagement is automatic.

You are correct. Mode actuates a solenoid which engages the interaxle differential lock. OK, not clear on a few things, do you have up and down motion on your pinion exiting the rear of the center differential? Were your U joints out of phase on the rear rear driveshaft?

Not strange at all, that is the interaxle differential, Wes is not familiar with those 'cause his old school 5 ton doesn't have one.

Progressive Commercial insures my and snowtrac's FMTVs. Is this still up in the air? Really need to park the truck if uninsured.

You would have to engage the inter axle differential lock, which puts the truck in "mode" (off road driving).

Option if center pumpkin is crapping out: limp to Many, Louisiana to MTP drivetrain and leave the truck there for repairs. Get a rental car at nearby Ft Polk. Drive to Houston, fly home then come back when repaired.

Each driveshaft needs to be phased with itself only, ie forward and rear ujoint in same plane. Up down wobble of any pinion is bad news.

I would expect that as the middle axle has extra gearset that raises the driveshaft. If nothing is grinding, howling, or slinging oil, press on.