I think there is some confusion in this thread, not all causes of vibrations are the same or are the symptoms. There are multiple issues that are all being discussed in this thread. Not a single issue.
1. A floorboard borne vibration felt by some in 4x4's when in 2wd. Some folks believe this is a front drive shaft viscous coupling issue. (Boxer, nhparrot, Taiga, jlarnold, bri, Offroad, Buzzard, Jlalib, rtm925, hgrace). The original topic in this thread
2. An un-diagnosed vibration. (tenntundra)
3. Vibration in floorboard and seat, happens in both 2wd & 4wd(mp3553)
4. Vibration solved by replacing tires (Herb)
5. An un-diagnosed vibration between 65 & 85 mph (jjcobra99)
6. An un-diagnosed vibration (jqqd)
7. Road surface induced vibration in a 4x2 (CYCLONE 123)
__________________
~Glenn~
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