Yeah I remember doing this on my old ty a while back and my brother (270lbs) used the 1/2" drive breaker bar and ended up shearing off the 1/2" drive peice into the socket in a twisting motion. He didnt use a pipe for an extension either. We eventually got it off though....thank god it was a craftsman breaker bar so that was free breakage. Good luck getting those off....you will im sure, but it may take a while at first.
later
Jordan