On my 51 1 Ton, I have removed the transmission a number of times to work on the clutch etc. I do this from underneath but if I need to remove it completely, I do it with an engine hoist.
From underneath I use a scissors transmission jack with a flat pan top. They are really reasonable to purchase. I made a small wooden base with pieces of 2x6 and chunks of 2x4. I made a U shaped base and stuck small pieces in the sides to fill in the contours of the tranny. I assembled it with screws. I put it on the jack, jack it up to take up the slack, put a couple of ratchet straps around and then I unbolt the transmission. Without the shifter I can roll it back, maybe lower it a bit and it creates all the space I need to do clutch work. The reinstallation is easy and it rolls into place perfectly.
