185,000 miles-half shafts chewed up and spit out

Ok, (maybe Grand Voyager, but I don't know how you tell the difference) with 3.3 Chrysler motor, 185,000+ miles on it.
This is an ugly, wonderful, loyal, and beloved minivan. It spat out the inner knuckle on an old passenger side half -shaft, and I didn't have a complaint about it. It was about time, I thought, and I put in a new one. Now it has chewed and regurgitated two more half shafts, boots intact and deposited the components of the innner knuckle in the street. I mean, I can't get half a block! I have a couple of guesses, but I think I really need good advice on this. Guess 1. Grand Voyagers take a different half shaft? They look the same and I don't know whether it is a Grand Voyager or not. Guess 2. I am missing a bad motor mount when I look for it. They all seem fine, but the location and amount of them and description of how to test their condition might answer the question. Yikes, do struts effect half shafts? Ball joints, TR ends, sway, controlling arm bushes all of these seem fine, too. AH!
Sincerely,
Thomas