Quote Originally Posted by Lucian08 View Post
I was about to post about a vibration noise, and this post came up as a suggestion to review. After reading through it, I seem to have similar issues to at least one or 2 others. My situation being that I have no noise until I hot about 40mph; after that there seems to be a vibration noise under acceleration or maintaining speed. No sound when letting off on the gas, and no sound under 40mph no matter driving style. One extra nugget of info is that I had this noise (or what I remember being this noise) both on acceleration AND deceleration; I hadn't driven in a couple months and just installed a diff drop (been sitting in the garage for far too long) and now the sound only seems to be as described above. I thought it may have been the CVs (and I had wanted a diff drop), but now I'm sure it must be something else. Front Diff? Rear Diff? I'll have a passenger drive with me this week to see if its coming more from front or rear, but the fact that it did change somewhat after the diff drop leads me to believe it is front related. Thoughts? The last post ended with the question of anyone actually having to replace a wheel bearing or diff; has anyone? Noise come or go after such a repair or upgrade?
Have you replaced diff fluids & transfer case and trans fluid lately? Greased the driveshaft? Sounds to me like normal noisy vx drivetrain, but my best reduction of the vibration was greasing the driveshaft, definitely helped. Tons of threads on vibration but Id do the fluids if you haven't lately. The vibration could be a driveshaft balance issue. Maybe you dented it?