How bad is it? I somehow have developed a hypersensitivity to driveline balance. I can pick up signs of unbalance in a third to half of the RWD vehicles I drive. I wish I didn't notice it because I don't like it. I can feel a touch of it in my low mile E450 at speeds over 65 to 70. Driveshaft spins quite fast on these vehciles w/ 4.56 ratio. The chassis could be well within specs, but the vibration sets off a resonance in the coach. No way I'm going to touch mine, probably the only direction it could get is worse. Hopefully if it is truly bad you can find a relatively inexpensive solution.
