Didn't think I would ever have such a thing, but I do! Under 55 is no problem, over 55, and I hit a bump, instant whole truck vibration. No steering wheel input, and its definitely coming from the rear. Hit another bump, and its fixed.
After pulling a stupid load, occasionally there was a clunk, or shift from a dead stop. Just like a transmission mount, or even motor mount going out. They all checked out, and I have been driving it unloaded for about 2 months now since. I have not experienced that shift without pulling a load since.
Today going home, I hit a pothole on the highway, and it sounded like I was crossing the hash marks to wake up drivers, and the whole truck shook. I pulled over, didnt see anything, and carried on. Hit another bump in the road, and it came right back.
I'm thinking centering pin, but I dont see any obvious signs of the axle moving. Thoughts?
This is what may have started all this crap...the wedge weighs in at 9k, and the middle jeep is a fat pig with a full cage, and 60's. I was not happy to pull it, but we were in a bind, and only had 50 miles to travel.