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I just got a private message correcting me, it appears the REV HMMWVs above serial 300000 got the helical gears, so will be a little more common. That being said, I don't know how much of those parts have hit the civilian/surplus market, so still going to be very rare compared to the standard...

The helicals are stronger and quieter at speed, but they also introduce a side load. I don't know what all they were used in, the only one I heard of was the H1 Alpha, so if that's the case you'd be looking at a limited production part made specifically for the civilian side of things. If they...