Can you lift the whole rootball as one piece that doesn't crumble? How about turning the pot's other side toward the sun for a while?

How big is the tree??does the roots fill the pot? There is a term called slip potting but that would be changing pots.. if you have to do this i would take the tree in a cool place no sun shineing on it carefully loosen the soil all around ease the tree around where you want it.water well and keep it out of the sun for a while watch for new growth then ease it back to sun..be very careful not to break the roots good luck john

Thanks for the tips guys. I can move the whole rootball easily. I will try this in the garage tomorrow and then keep the tree in the shade for a few days.

Everything went well...nice cloudy day here too. Thanks for the tips.