Using a Floor Jack as a Transmission Jack?

I did the A833 off the chest a few times back in my 20's. Never got hurt installing. On the other hand, pulling it out one time, as it came down it crushed the little finger of my left hand between the concrete floor and the transmission tailshaft (which was the ball and trunnion type coupler). Cut a gash in my little finger almost to the bone.

This was probably two or three in the morning in the garage of a cattle ranch. It could have used a few stitches, but I just applied pressure for about half an hour to stop the bleeding, yelling obscenities the entire time. Still have the scar to prove it.