transit visa in china for change of airports

While travelling to Japan from India by China Eastern airlines we need to change airports at Shanghai (PVG to SHA.) Connection time is about 5 hours. Is a transit entry permit required to move out of one airport to the other for the connecting flight? If required is it available on arrival? Is the connection time sufficient to change airport after making the transit G type on arrival at PVG (Pudong) airport?
Pl reply if you have an answer.