My "new" axle stub has been on for a little over a month, and no problems at all. I greased packed all the wheel bearings on the trailer last year when I got it, so that I wouldn't have any oil problems.
The axle doctor said that failures on greased packed ones were rare, BUT did happen, he blamed it on the bearings, he said they just aren't good quality anymore.
I found out from a friend of mine that he had replaced the stub on his drive axle 2 years ago, they can even do that now, he said no problems at all with it, pretty slick repair if you ask me, saves time and money, the local trailer parts place here has a new trailer axle complete for $1500, over the counter, doesn't include brake shoes,drums or brake cans, has the "S" cams though.
I think we got off cheap with the fix
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