Glad that it worked itself out.....sort of. It does sound like you where stuck in four low, and that when you were on the incline some things finally disengaged and dropped back into four high

For future reference I have read somewhere here on the site that it is best to put a spare, or different diameter tire, on the front of the VX. If the two back tires are a different size the TOD system reads the different speeds of the tires (due to their differing diameters) as wheel slippage and pushes power to the front wheels to stop that slipping. Since the wheels aren't really slipping, just turning at different rates, the TOD will continue to read that and continue to push power to the front wheels. When the TOD shifts power to the front wheels it really isn't a constant power, it tends to "pulse" the power forward. This pulsing is what creates the jerking motion that some describe when they talk about the TOD freaking out.

If you ever have to put a spare on your VX, and it's one of the rear tires, the best thing to do it to take one of the tires off of the front, place it on the rear, and put the spare on the front. PITA, I know, but your TOD will be much happier until you can figure out a more permenant fix.