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Its not wrong - that is how it works and it is what you're describing as well. When the HET is in high range, the switch engages the front axle but leaves the interaxle differentials unlocked. This provides power to all 8 tires, but because the interaxle differentials are unlocked and the axle...

With the HET, it works like this - Transfer high, switch off = high range, rear axles only powered, interaxle diffs unlocked Transfer high, switch on = high range, all axles powered, interaxle diffs unlocked Transfer low, switch off = low range, all axles powered, interaxle diffs unlocked...

I think a better analogy than the rear tandems being in 2WD would be that they are in all wheel drive (AWD). Examine a typical highway scenario - Transfer case in high range and traction control lever in neutral position - interaxle differential unlocked and no power to the front tandem axles...

I think that wrecker burnout was done using caging bolts on the #3 axle and setting the parking brake.

When you say "inner axles" are you meaning the #2 and #3 axles? I don't have any real HEMTT experience, and I can't say for sure in so far as how this applies to the HEMTT, but I think you misunderstand interaxle differentials. A truck like a deuce or 5 ton have no interaxle differential...

"In left position (INTER-AXLE DIFF. LOCK) locks interaxle differentials in front and rear tandems. In right position (8X8 DRIVE), engages transfer case drive to front axle." Putting the transfer case in Low range puts it in 8x8 mode as well. I would suspect it to work like this - Transfer...