stripped rear end bolt

[87 Supra]

Ok I’m in trouble with my Supra right now. The rear end has been singing so I’m swapping it out with one from my parts car. All the bolts are out but one. It’s the driver side cross member bolt that’s nearest to the driveshaft. This dang thing is stripped in there. Not rounded off mind you. This thing turns and turns but wont come out. It loosened up just a bit and that it. The other bolt just like it came out from the other side with some good rust on the first part of the threads. I’m guessing this thing is the same but worse. I put a crow bar on the rear end to pull it down and hopefully allow the threads to bite but no sale. It’s a big a$$ bolt too. Any ideas? I dont want to drill it... its a monster.