Bringing back this thread. I finally got around to installing centramatic rings on all 4 corners. The truck is now silky smooth below 60 and these rings really do stop vibrations, HOWEVER, as soon as i exceed 60mph the shake starts. With the rings its very easy now to identify the shake. Its more like a wobble, and im sure its coming from the rear.
The strange thing is, once the shake starts it doesnt go away, even when i slow down to 55. I have to slow all the way down to like 40 for it to “reset”. Im starting to think i have a bent axle. This issue is depressing. Whats funny is how awesome this thing drives now below 60 mph. Its like **** racecar with all these new parts. It just has shaking fits after that speed.