I addressed a driveline vibration @ 60/70mph i've had for a wee while now.
As usual these things seem to manifest themselves right at the freeway cruising 'sweet spot'.

I re-balanced both rear wheels,one of which I noticed had thrown weights and re-set the pinion angle,I made a 1/2" packer for the rear trans mount to raise the trans tailshaft and re-adjusted the lower link bars.

First impressions are good but will find out for sure today when I go to Glasgow,about 25 miles at freeway speeds.

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.