You can't get it with an impact gun? For your alternator, you can try heating up the nut with a propane torch. Keep the flame on it until it's searing hot, then take an impact gun to it. The heat should expand the nut enough to peel it off. The crank pulley bolt, well...i have no other ideas. Make sure the compressor is at full charge, and there's no extentions or adaptors for your socket set. Just gun and socket...nothing else.