So hears my problem,putting a flathead in the 31 with a stock 31 banjo rearend. I hear this will be a weak link,even with a stock flathead. Any ideas on what to do with this issue I mean breaking a rearend at 30 mph would be bad enough,but don't think it would be a good thing at 60 mph. Like to get some ideas about what to do.Thank's guys.