89 halfshaft removal problem :(

Hello all. I have a 1989 buick T-type with a 3.8 vin C in it swapped in from a 1990 oldsmobile. I wrecked the olds on the front drivers side. Since the swap, I drove the car about 250 miles with absolutely no problems, but then a leak all at once.

After the swap into the LeSabre, the transmission seal around the driver's side halfshaft started leaking but the shaft seems to be stuck (probalby from the wreck). My mechanic tried a 10 pound slide hammer and three guys with prybars but it wouldn't budge at all. He suggests that he could try to weld some chains onto the tulip (the remaining portion of the shaft in the tranny, the rest was torn apart) and pull it off with a come-along. However, he is not sure if this would damage the transmission or if the transmission is already damaged from having the tulip stuck anyway.

I have a spare transmission that is good, but I have no clue how many miles are on it so it would be an option to just swap in the other tranny...however, I just got done with an engine/tranny swap and I'm really not up to doing a tranny swap now, especially since the current transmission only has 45 thousand miles on it.

So what do you guys think? Should I let the shop try to yank on it with a come-along (I have a spare halfshaft to replaced the destroyed one with) or should I just give up and replace the tranny? Or is there a way to remove a portion of the transmission to remove it without having to remove the whole transmission?

Help would be great!! I'm going to post in the other H-body forums and see what I can get too :(