[RyanAK]

The hose clamp trick is definitely worth trying. I found front and rear driveshafts somewhat local with a guy that has a stockpile of squarebody stuff. I’m considering getting one of each and having them rebuilt/balanced and swapping them in. But the hose clamps are a good idea to try.

demian5 - what symptoms were you experiencing? I need tires anyway, and will be springing for them as soon as I can decide on a good-looking set of 16” wheels for this rig. I assume driveline somewhere since the vibration is specific to 45-55 (and I’ve now discovered it’s back between 65-70) and I think tire issues would occur at all speeds, getting worse as you go faster. But maybe I’m wrong...

Decided to take the Suburban out of town for work this week. Other than the vibrations, it did well. Here’s a couple photos.