Another thought seriously if it is leaking out the end of the transmission it could also run down the torque tube and into the differential and contaminate your differential oil (grease.) You might consider checking the level of your differential oil, if it is over full you have a bigger problem. Drain it out. I drilled an 1/8 hole in the bottom of my torque tube near where the torque tube attaches to the differential. Any transmission oil now runs out there and not into my differential.