I think have either a busted hub/CV/Axle Shaft and a T case issue. After drive a couple of hours on the highway (interstate) cruising around 75-80 mph, I got off the highway and when make a left turn at the stop light it felt like I was in 4wd with the front diff locked. Really wanted to push through the turn, I stopped at a near by parking lot to inspect for damage. I was in 2wd and the front diff lock wasn't engaged (doesn't work any way), shifted the t case from 2wd to AWD to 4HI to 4LO and it felt/shifted fine. Drove in very slow circles around the parking lot and front axle start making popping sounds and front of the 280 raised up with a louder pop and lowed down. After that the steering was normal but there was a very quite clicking/clunking sound coming from the front axle. When I drove around the parking lot I noticed that the speedo wasn't working, I know the speedo drive is in the t case so at a slow speed I turned to shift to AWD but it made a grinding sound. I stopped and shift into AWD, which felt normal/smooth and started to drive around again, this time the speedo was working. While driving slowly in the parking lot in AWD I shifted back to 2wd, which was normal other then the speedo dropping off line, but when I tried to shift back to AWD it made a grinding sound. I also noticed that the clicking/clunking sound was quieter in AWD then in 2wd, turning in circles didn't change anything. When I got the 280GE home I tried to drive up a clay hill to test the 4wd and in AWD/4HI/4LO the front wheels failed to turn. I jacked up the 280 and put it on jack stands and put it in 4hi and the drive front shaft turns but not the front wheels.
Right now I plan on pulling the axle down (hubs/knuckles) and inspect for damage. What could be the cause of the speedo not working in 2wd only? What would cause the t case grinding? It only grinds going from 2wd to AWD, going from AWD to 4HI is fine and when shifted to 4LO (when stopped) is fine.
There are no odd vibrations when driving (short dist.) got up to 50 mph.
Thanks for all advice and help.
Steven