I am curious how big the tree is? Fall would be best by far to transplant. Same circumference as the tree is a good role of thumb, but I would go as large as possible.

Not that big a tree, I planted is about three years ago, probably about six or seven feet tall, the trunk circumference is only about 2 1/2 inches.

Pee Gee's are very hardy. I have transplanted one before also. Fall again is the best time and before filling the whole back in soak it down around the roots. Along with plenty of water for weeks afterwards. GOOD LUCK!