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Too bad there isn't an access hole from the top, about the center of gravity of the transmission, for a lift strap hoist or something. I could be tempted to make one with a grinder cut wheel and form a plate to cover the hole after it's re-assembled. I'm glad the top of the tranny is open on...

I wouldn't buy a used tranny that has had motor oil in it, only one with ATF. My mechanic who had Allison certificates, says the frictions and steels act differently and while oil may work, oil reacts with the friction material negatively....so I trust him. You probably have (only) one...

Try C&C Surplus in south Indiana for a working take out. Don't buy one with motor oil.

You take the chance of more parts coming off internally and getting into gears or bearings that otherwise may be fine.

Do you see the gear like shape of the piece on the left? That, I think, is the inner part of a friction clutch plate. Some of the disk may still be in place in the clutch, ready to do more damage. You have no choice but to pull.

Looks like clutch, but I can't tell in the photo's.

Not necessarily, depends on the wear on the remaining parts. Trash is a relative term since about every individual part can be had for a price.

Sounds like the clutch pack piston seal is not holding pressure. On my M35A3 the frictions and steels got so hot they literally melted the piston that holds pressure against the steel/friction clutch pack of the 4th and reverse clutch. I suspect the operator kept thinking higher RPM was going...