Hi I'd like to report back with an update on the hunt for the vibes.
After getting the wheel ballencing , alignment , steering parts replacement done, There still remained an annoying vibration in the driveline.
I found a good family run machine shop that does mainly drive train work, driveshafts of all sorts.
Some of the problems they corrected were mid shaft needed an end cut off and rotated to get it into phase correctly, the rear shaft needed lengthening by 1.5 inches to get correct engagement to the splined shaft, all shafts needed ballencing, and both carrier barrings were replaced.
In other words the whole shooting match was done.
Well so far with just a short 15mi. test drive, this seems to have been a big step towards a smooth ride. :-)
It is interesting how solving one problem in this sort of assyembly will sometimes reveal another issue. I'm hopefully that this series of repairs will finally put the vibration issue to rest and let me focus on other parts of the coach for a while.
Oh. While waiting for the shaft work to be done, I replaced the power converter,
Wow, what an improvement , I can now use the dash stereo while pluged in to shore power with out the loud static noise that had been happening, also the performance of the television is way better, much clearer pic, and stronger signal, all the 12 volt
lights in the coach seem a bit brighter. Nice unexpected bennifits.
Thanks to all here for the informed and helpful discussion.