It's been a few years since my last AOD removal/install, but I believe for the cross member mounts at the frame rails the bolt head may not be the same size as the nut on the bottom. My vote would be to cut the cross member. You also have a chance of the body mounts on the car being shot, which would mean the bolts could not be removed if you don't have a way to jack the body up enough to get the bolts to clear the floor pans.
The AOD is one heavy SOB. How are you supporting and lowing this trans? Yards around here don't allow jacks, but the yard you are going to may have different policies. (Sorry if I already asked and you already answered, just want to be sure you are prepared as well as you can be.) I once built a platform of 4x4 wood (probably less than 2ft long each) to rest the trans on oil pan on (arranged something like the picture attached, obviously not with round wood). Then slowly lifted one end/side of the trans at a time removing one piece of wood at a time until I had the trans on the ground and could slide it out from under the car. It was a PITA but slowly got the job done. (This was before I had my own trans jack and I must not have been able to borrow my uncle's and didn't have time to wait for his to become available.)
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