The Stovebolt Site Forums The Shop Area Driveline HELP! Transmission fluid leaking into the rear end.

HELP! I have a 1949 Chevrolet 3100 Pickup that is leaking transmission through the drive shaft into the rear end. What would be causing this? Every time I take it out on the road I have to drain the rear end, and fill the transmission. Any help will be greatly appreciated. Thank you!