I need to replace the lower lift arms on my 1974 ford 4400 . Can anyone tell me how to get the connection at the bottom of the tractor where the lift arms bolt up to the tractor . There is a large castle nut with a cotter pin on one side which I removed and I cant get the shaft or bolt or whatever it is out ,On the opposite side of the shaft there is what looks like a 1"x1/2" rectangular protrusion that sticks out and I cant turn it or hammer it out I don't know if this bolt or shaft screws out or is supposed to just slide out there isn't much room under there so I really don't see how I could hammer it out. spent over $200 dollars on 3 point hitch lower lift arms that I cant connect. appreciate any help. :x