I added a '54 2-ton to my fleet last year and pickup up a 55.1 2-ton to use for parts earlier this summer. I've been taking the parts truck down to the frame to do a general clean-up, new brake-lines etc. One of the front spring hangers had shackle pin stuck in it that wouldn't move. I also couldn't pull or drive the bushing out with the usual puller/hammer/heat or any combination of them.
It was about then that I remembered I had this ancient and huge puller setup I'd bought at a garage sale 20+ years ago.
Here's a link to a short series of pictures of the operation:Hardcore Pin Removal
That's an 18-inch Crescent wrench on the ground in one of the pictures and it took all of it before the pin started to move.
You might be able to find a rental outfit that has a puller setup similar to the one I used. It sure worked when nothing else would.