I'm changing out all my pulleys on my 2012 5.0 to an 8 rib setup and cannot for the life of me get my alternator pulley off Ive used my impact on it, held it with a chain wrench and used a 2 ft breaker bar and nothing does anyone have any idea what to do I'm sure someone on this site has done this before if anyone could help or has any input that would be cool