95 Mistubishi Fuso box truck...how to separate Aisin trans from engine?

Trans had no reverse so I picked up a trans from a 96 truck to try. Trans appears the same but bellhousing is different. Problem is...the 96 had inspection plates and taking them off to get to the converter bolts was easy. My truck on the other hand has no removeable plates. I looked in the starter hole...cant get anything from there.

So I cut my own access hole on the underside of the bellhousing to see whats going on...there appears to be some kind of large drum in front of or part of the converter and no bolts are visible. The whole thing is unbolted from the engine, and I can use a pry bar to begin separating the two at the top but it pops right back and I'm afraid to pry.

Can anyone tell me how this is supposed to separate?

Thanks