Is there something I'm missing here?

I removed a transmission from a 617.950 and am attempting to mate it to a 617.952. It just doesn't seem to want to fit snug up against the engine. Is there a trick to this? I didn't want to force it thinking I'm might screw up something, but maybe it just takes more force than I thought it should (never having done this before).

Maybe someone with more experience that I can help me out on this or has some advise?

thanks.

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Rev. Dr. G. Church of the SubGenius
It doesn't take a genius