Originally Posted by BatteredBenz

You are trying to remove the ferrule that is crimped onto the speedo drive's outer sheath, correct? The flexible driven shaft is no longer present and the corrugated plastic covered outer sheath has been broken off, right?

If that's so you should have an opening down through the center where the driven flexible shaft would normally reside, I would start thinking if I could fabricate some sort of hooked rod that could be inserted into the hole, catch the inside edge and use some sort of slide hammer to try and work it outward. Before doing that I would remove the 10 mm bolt from its clamping position and gently tap a wedge of some sort between the two sides of the clamp with the hope of expanding it a tiny bit to break the corrosion loose. Douche it good with some penetrant KROIL or such for a couple days. In the interim some judicious tapping of the broken off part could help loosen things up enough as well.

I don't recall exactly what material the ferrule end is made of, aluminum or steel, might be able to tap some threads down into the center hole. Probably pull parts of the spiral steel sheath out first then some of the plastic outer covering but eventually you should get to the "meat" of the ferrule that could be tapped and pulled with a slide hammer tool.

As far as the broken off ear, you're talking about the aluminum part of the tranny case one? I had that happen years ago and we made that bracket out of a couple pieces of steel that you could remove two of the longer transmission case bolts along the bottom rear edge that hold the tranny tail piece in place and then place the bracket and replace the bolts. The bracket was maybe an 1/8" think so there was still plenty of bolt thread to keep it all together