Damn! Broken tail shaft section.

I took my recent good buy on a so called running recently pulled 74 Chrysler 80k mi. 440 727 combo to the carwash today to see whats under the grease and oil. I discovered a big crack in the tail shaft section of the trans. I am yet to tear into anything and I hope I didn't get taken. I only gave $350 for both, he wanted $500. I have heard that this can be a weak point on these anyway. My question is does anyone make a stronger one? Aftermarket? Different model?
Author: admin