I've tried every thing i know of to break them loose soaked em in pb blast then a 1/2 ingersol the a 3/4 ingersol gun then propane tourch then 3/4 ratchet and 5 ft cheater pipe and pull so hard i know that ratchet head is going to explode and didnt move one bit the only thing left i can think of is a 4 to 1 multiplier ratchet head we used to use em to get track bolts off big cat eqipment but i havnt seen one in years so if you have another idea BLAST AWAY !!!