Though this method doesn't seem efficient, sometimes it's the only way to get those top bolts out. In my short amount of experience in automotives, I have removed and installed 2 trannies, i believe. In both, I had access to a Hydraulic lift so that I could gain more access under the vehicle. I had to use 4-6 extensions on a ratchet with hella lights to be able to see what I was doing. These were on trucks though, so there was probably even more room to work with on those than in your 'stang. But you may give that a try if you've got a lifter.