I have a 2000 Disco 2. It has 138K miles. Couple days ago I started feeling almost a vibrate but not quite when around 2000 rpms, and also when around 65mph. The only thing I can think of that I did was accidentally back up with the parking brake on, other than that the feeling generally stops when I stop accelerating or am around 65mph like I said.
I check the U-joints and it just rotates like it should, nothing weird on either U-joints. Replaced spark plugs and wires yesterday, and changing brakes today. I want to get an idea on what it is, other that the vibrating feeling, the truck runs fine as Im taking it 4 hours away this weekend. I know eventually I need to replace the U-joints but I dont think its them quite yet, or maybe they just started.

Any ideas?

 

U joints. You can't just rotate the shafts you have to yank them side to side and feel the shaft for movement. Also check your motor mounts. Notorious for the rubber isolator to separate from either mount plate.