8 3/4 diff numbers

AJ/FormS said

AFAIK the X indicate that it is a SureGrip model.

Edit;
See below; as can be seen, AFAIK means zippo. lol.
I guess I'll just go take all my SGs out of the X cases now, and sell them separately, as they no longer need to stay in the X cases......... that will save on shipping as well.

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Where have you been, under a rock?
You know that those sure grips in that 741 housing will also fit the 742 and the 489. Lots of 741 came with an open differential and a lot came with a Sure Grip or a track lock whatever you want to call it. But if you go ahead and pull your sure grips out and want to sell them price them to where I can buy a few. Thank you

What does AFIAK mean?