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That's called a Double-Cardan joint. It's weaker, and one of the military engineering reports says specifically that they considered it, but couldn't get one strong enough.

While using synthetic grease can't hurt, I don't think it's going to significantly change any of this issue. The cause of the spline issues is the combination of drive angle geometry, joint style, robustness vs. weight trade-offs, and several other factors. My interpretation is that once the...

Generally, yes. Over time, the balance could degrade - the military testing showed this. I would be cautious, and get them checked every several years, or if you damage/replace something in the driveline. Considering how destructive it could be, this seems like good prevention.

While that certainly wouldn't help, the causes are very well documented and understood, and the are due to the design of the shafts.

Anytime I look at the Facebook group, I'm amazed by what is asked, and how poor the answers are. I'm surprised they can get the trucks running at all.

There has been a rash of posts on the Facebook page of people destroying stuff because of unbalanced driveshafts lately. One guy cracked his engine block, just like I did.

I will also usually get a shimmy until I've driven it a while. I assume this is the tires sitting a little, and getting out of round.

I destroyed an engine because of the driveshafts being out of balance. More info about the the issues, engineering reports, and fixes here in the doc in my signature. This should be one of the first thing any new FMTV owner does, because while it is only a small percentage it happens to, it's...