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that is correct , the 489 case is stronger, but you have top replace the crush sleeve with the bushing kit,

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That may be debatable but I don't think so. MP could have used any case they wanted to pattern their aluminum case after and they chose to use the 742. There is no debate that the 742 has the biggest rear pinion bearing and that makes it a better choice despite the pinion shaft size. Which as I pointed out earlier is a non issue.
I have the 742 that must be why it hasnt broke yet!
Just how much better is a 742 though? I don't know. I'm not an engineer but I don't think it's a significant difference.

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