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I believe the chinese receivers are around 47c to 50c rockwell. And they reharden them up to 52c rockwell.

Back in the 70's my new borgwarner super T-10 4 speed tranny blew 2 times. When i compared the hardness of the gears to the muncie 4spds the muncie gears were much harder. The degree of the Hardness can mean success or complete failure.
 
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