Yukon gears ..box says MUST ream the case holes???

I have no Idea what this means
they are thick gears if that matters????

are the bolts holding the ring gear a different diameter? I seem to recall something about that from previous reading....

regardless, I really doubt you'll get a solid answer tonight, so just wait till morning and call Randy's R&P or a shop you trust.

If those are the new gears desinged for a rubi then most likely yes,see post #3.
http://www.naxja.org/forum/showthread.php?t=66744&highlight=rubicon+lockers