Siezed rear leaf shackle pivot pin!!! Help

[1953]

Ok i am removing the rear end and leafs well turns out the pivot pin that runs threw the shackle and rear leaf hangers are seized to the shackle itself, there is a hole in the frame where i can get to the pin ive heated the shackel and pin tryed air hammer it out threw the fram hole ive tried a slide hammer and blunt force in any way you can think of without damaging the hanger is there somthing im missing here ? slide hammer should have pulled it right out. Nope. The pinch bolts all came out no problem its jist the pivot pin Siezed to shackel the shackle moves freely bit the pin moves with it any ideas on what i can do here to pull these pins?