You should be able to reuse your steering shaft. It is just rusted together at the slip joint. Remove it and take it apart. Clean the slip joint and lube it. Are you saying just the inner bearing race is still on the steering column? The bearing will slide off of the steering column without heat or major force. Try spraying some penetrating oil on it. I got my replacement bearing from Quadratec. To get the steering shaft off completely remove the bolts on the u-joints and use a large chisel driven in the slot to loosen the grip so it came be slid off the shaft.
91 Wrangler 4.0 5sp
8.8 4.10 explorer axle, 33x12.50x15 x-terrains,Rancho 2.5 lift and shocks, Goforit 1" motor mount lift, 1" body lift, sailcloth top with tinted windows