Thanks. That all sounds consistent with my experience. After posting, I was reading and it looks like driveline vibration is a widely discussed subject.
I am new to posting so I hope I get this right.
I thought I would pass along some hard-earned knowledge about my 80's drivelines and U-joints. The problems started five or six years ago with a mild 2-inch Old Man Emu lift. Shortly after the lift the truck started vibrating. It seemed to be...