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I'm pretty sure the helical gears are stronger. You get much more surface area when you twist the contact patch.

the H1 Alpha is the only one with helical gears, it was done to help try and hold the torque of the duramax. All other hmmwv's and H1's have straight cut gears.

the ctis on the H1 can have problems, it's more automatic with electronics. the hmmwv CTIS is all manual, 1 valve and 1 pump. very trouble free, mine only gets turned one once a week to run the air up after it gets cold out. there are only 4 points of friction in the hmmwv and H1 CTIS system...

yup, the only real difference in hubs over the years was the upgrade to 12.1k inputs and then the total upgrade to the alpha hub. CTIS was also mixed in between all makes and models.