From my experience with hardened pinions, they arn't too good. I got mine from Mr Constructor. They cost a 3rd of what the RCM are, so that might be a hint to why they only lasted a few runs. ;)
Well I had one from the mbx ofna with the 4 spyder gears in it. It was pretty tough. I never had a problem with the diff just spur gears. The center diff has less pressure on it than the front and back diffs. With the 3.31 diff gears it has that much more pressure on the front and back one.
Peace!
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