High speed vibration.
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Just replaced the u-joint on rear shaft, it seemed okay maybe a little floppy. But, I think I found the problem. Several of the nuts holding the shaft on where about finger tight. You can see where the shaft rubbed a shiny spot on the parking brake drum
Also, because of the slop the set screw on the drum had backed out proud of the drum face, slightly holding out the yoke flange. You can see the imprint on the flange
So If I had tried to tighten the nuts down the set screw would have held the flange slightly crooked. So If you find these nuts to be loose, you need to drop this side of the shaft and make sure the set screw on the drum has not backed out.
I will try to get it out on the interstate tomorrow to check if the vibration is fixed, but I would be shocked if this was not the cause of my problem.
Also, because of the slop the set screw on the drum had backed out proud of the drum face, slightly holding out the yoke flange. You can see the imprint on the flange
So If I had tried to tighten the nuts down the set screw would have held the flange slightly crooked. So If you find these nuts to be loose, you need to drop this side of the shaft and make sure the set screw on the drum has not backed out.
I will try to get it out on the interstate tomorrow to check if the vibration is fixed, but I would be shocked if this was not the cause of my problem.