I have a leaking transmission tail shaft seal thar refuses to allow me to change it. Seems the people that built the car decided to put in two drive-shaft loops , instead of one, and one is very close to the seal and the next one is just a few inches down the shaft. There is a third loop at the rear as required by rules. Those front two loops prevent me from getting a good tap on the seal.  We may have to remove that front  loop, which is a real pain.