I took mine apart tonight... 1/2 in breaker bar, 15/16 socket, put 'er in fifth, locked the brake... took three monster pulls on the bar and she came right off.

You said you first used the 500/lb impact wrench ?

I've gotta ask this, no intent at offense, but are you absolutely sure you didn't TIGHTEN it first ????? If you had the impact wrench set the wrong way, and tightened it, I doubt you would ever get it off with a breaker bar.

I've had moments like that myself, that's the only reason I'm asking!

Good luck!
Jeff