I've been trying research it, and just about all the test data I've read states the contrary. The best powdered-metal gears are rated at 25% less overall strength then the best heat-treated steel gears. The surface-hardness is sometimes equal though. And note, I cited tests on the best of both types. I have NO data on what GM uses in their steel or their powdered metal gears. From what I've read, the powered-metal gears save machining time and waste and tend to be more perfectly formed then machined gears. I've yet though to find anything that shows them as stronger, or even equal.
Note I'm not disputing what you say. I'm fully admiting I don't know and am trying to research.
Obvisously, I have no way of determining any of this myself. So, I've got to believe what I read.
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