Ok, need to close up this thread.
Got another turbo shipped to me thanks to Rayzer (you can count on a woodworker to make a nice shipping box) and installed it while parked-up in the NF.
After that everything sounded normal again. The turbo did seem to kick in a bit later than I was used to (they are both "C"s) and its burning a bit richer than it was (but that could also be the oil left over in the intake?). Found an old air filter that I had taken off the She Beast at one of my caches, it was in much better shape and switched that out. Did find out that not all air filters in these trucks have the same size OD. Any Idea why?
So far so good.
Did shed the tread off another tire about 150 miles later, one I just bought. That makes three in about three months.
Is any one else have trouble w/ the G-177's loosing their tread? I haven't been able to figure out any reason why it's happening and its all on the same side of the truck. The last one lost it as a complete ring.
In a few days I'll be doing another 600+ miles, so hopefully the rest of my tires hold their tread.