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You need a long breaker bar. That bolt might be on there tight but it's not impossible. If you let your box-end wrench slip off the bolt too many times, your bolt head is going to become rounded, so I'd abandon that particular approach. Forget the air wrench also... in my experience a lot of the snapping torque of the air wrench gets absorbed by the u-joint.
I always use 36" of extensions, and run them along side the shift linkage, on top of the O/D solenoid and on top of the crossmember. I connect my 24" breaker bar to the extensions at the back of the transmission near the output shaft. One time I encountered a bolt so tight that I lifted myself up off the ground pulling down on the end of the 24" breaker bar (I weigh 175), but I just had to bounce on it a couple times and it broke free.
I've never had to do this to get at that particular bolt, but you might find there is more room to work by removing the tranmission crossmember and letting the back of the transmission fall downward (properly supported by a jack, of course), which lets the front of the engine pop up. This is how you get at the bolt on the very top of the bell-housing, and would probably give you more room to work on your problem bolt. But again, I've never had to do that.
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