These are pretty bad. I've gone through a couple of sets of replacements and this is about the worst they have gotten. They click sometimes driving straight, and I get this violent steering wheel shaking. I don't 4 wheel it, though live on a dirt road. The wagon has 353 K on it though. I have packed grease into the torn boots before, but not on these. May be worth a try again.
Maybe I won't pull the axle shafts, but I like Durania 717's idea of roasting them back tires!
Anyway 353 k -and still a good ride!