For the record, I don't own an FMTV (yet). I follow this forum because I would like one and want to get informed. Also, I'm sure I'll regret commenting on this. At this point for me, it's just an interesting physics problem.
I have read the gearing tutorial, and bookmarked it. Thanks for posting that. It is a good reference.
Respectfully, I suggest that the 1.71 argument is flawed. This is because the spider gear assembly drives the wheel, not the annulus gear. I argue that the arc covered by the spider gear assembly will always be 1/2 the arc covered by the sun gear (drive shaft) regardless of the tooth counts on any of the gears. So, I argue 2:1 reduction.
If by some mechanism, the spider gear assembly were fixed to the front axle and the annulus gear fixed to the wheel, then the 1.71:1 ratio would be correct.
Again, just MHO. There is a definitive test. If someone has a diff cover removed and the axle jacked up, turn the wheel one rotation and observe how many rotations the drive shaft makes. Can't argue with that.
More generally, thank you to all of you who are so free with your expertise. I've learned a lot!