Torque tube seal leak allows trans fluid into the rear end which will f...up a rear end. Replace the TT seal and that should take care of the leak. Glad you kept the "eight in a row". You knew it wasn't going to be ALL peaches and cream on this fine ride. I found a 4dr '50 last month and I got excited seeing it was a 3 onda tree. I haven't bought it yet. The std. trans straight 8 Buicks are known for there speed. The dynaslows are known for there smoothness.