1963 Dart Wagon...broken auto tailshaft

This is the place to ask a question.....a young Marine called me and asked if his tailshaft on his auto transmission could be replaced. He has a 1963 Dart Wagon....6 cylinder...push-button. He says the tail shaft on the trans was cracked for a long time. It finally broke. He says...What do I do now???
So...guys..help me help him.
He is in Vista, California...I believe. What is your counsel????????