Heavy application of a good penetrating oil like Aerokroil

Put tension on it with the pitman puller if possible, or wedges if not.

Get a torch and put heat to the outter surface

Set up some vibrations with steady hammer blows

Do the tension, heating, vibration all at the same time, make sure the tension stays on with periodic adjustment.

Then swear a lot...............that's the clincher. They need to be talked to.