Not crazy about the torch idea, although I know it is done. You can use a heat gun if you want. GM ring gears generally only have .0005-.001" press fit on them. I would set the case on the bench with the bearing race, (cup) on the case bearing for protection. Then use a punch that will pass through the ring gear threads to the bottom of the bolt holes. Give a solid smack with a ball peen, then go 180 degrees, then 90 degrees, and so forth until it comes off. I have never had an issue removing them that way. The service manuals sometimes say thread in 4 bolts a few threads and tap the bolts. I like the punch method better.
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