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My flange was pretty rusted out, so I went this route. Flange repair kit.
The studs on the original are press fit, and even with heat...they can be a bugger to beat out. Mainly because of the position you are in and having to hold on to the flange and beat it at the same time. Yes, it's possible to do...but a pain. I was actually able to get the three studs out of the flange over the rear axle pretty easily, but it was out in the open more.
Propane torch didn't work for me. Did a lot of drilling and dremeling and finally got them out. New bolts I picked up are a little loose in there as the old bolts had a collar around it. I don't think it'll matter. Onwards