Your first mistake was putting heat on that flange. Never use heat on something like that unless it is a last ditch effort, and you don&#039;t want to save the part. What you did by heating was to set up an oxidation process which further seized the flange to the axle shaft. Now, what you can try, and it might work, is, get some good penetrating oil, like Gibbs, or Blaster. Spray as much of it as you can get into the spline, every day for a couple of weeks, each time you do this smack the flange a few times with a brass hammer, to set up a vibration. This helps the oil get into the spline. get some 8 or 10 inch channel channel iron, cut one piece where it will fit snuggly around the axle, with the axle centered on the channel, then cut a piece of steel to bolt to the channel, it must go across the slot you cut in the channel, and take up the slack against the axle. Get 4 lengths of 3/4&amp;quot; all thread, and nuts. In the piece of channel you just worked on, drill 4 3/4&amp;quot; holes, 2 on each end. Make sure they are equally spaced, and so that the all thread will be as close to the flange as possible. Take another piece of channel and drill 4, 3/4&amp;quot; holes that coorespond to the other 4 you drilled. Get a big bottle jack, 20 tons or larger. Screw a nut on each piece of all thread, then put the all thread thru each hole on the first channel you made, put a nut on the back, &amp;amp; tighten the first nuts that you put on the all thread. Put a nut on the other end of each all thread, put the other piece of channel on the all thread, put nuts on the end behind this channel. Make sure the channels are equally spaced apart, using the all thread as an adjustment, measure at each all thread, leaving enough room between the axle shaft, and the outboard channel to get the bottle jack into. Put the ram on the jack against the axle shaft, the base against outboard channel, and the pump on the jack down beneath the jack so it gets fluid. Put on your hard hat, safety glasses, steel toes, etc. and pump the jack, pushing against the axle, pulling against the flange. If it doesn&#039;t move, spray some more penetrating oil, smack it with a brass hammer, and leave it with pressure on it. Keep doing this every day or so until it breaks loose.