I don't know why people on here give others so much grief about it, but I just used a 1" hole saw and cut 2 holes in the trans tunnel in the locations that corresponded with a straight socket/short extension "path" to the outer 2 of the upper 3 trans bolts. Locating those holes needs to be done carefully if you go for that method. You don't want to Swiss-cheese your tunnel/firewall.
The end-result of the above is that all 3 of the top mount bolts can be accessed easily from inside the car with a socket and 6" extension.
After cleaning the holes up, closed them up with 1.25" rubber grommets (Dorman CTI 90306) and moved on with life. I'm too old and too anal about achieving correct torque values on critical mountings than to spend my time contorting and using 3 feet of extensions to tighten those bolts. In my case, I've had the engine/auto trans removed multiple times before finally going with a 5-speed, so it paid to make things easier.
But beware, if you do what I described and say so, there are many on this site that will consider you a failure for doing so. It's apparently a rite of passage in the Eagle world to make life unnecessarily difficult on yourself.
David
I actually managed to use a torque wrench on those - once - not worth the trouble to do it again. I used a 1/2 drive super-long extension, a short impact wiggle socket, with another impact wiggle under that socket. Would almost make 90 degrees of bend!