hi people,i was changing the rear of Chevelle 71,and all went well till unbolted the lower control arms,nuts came off ok,but cant get the bolt out of the control arm,rear bolt that,haven't done front bolt on control arm, following the chiltons book,tried a wood block and hit with hammer,and tried using a c-clamp to push out,even tried vice grips on bolt head,nothing seems to work,,bolt still turns real hard with a breaker bar,have floor jack under rear,and has a lil pressure,even jacked it up some,to see if pressure would let go,let way down to,really need some here,any ideas,thanks