if i remember correct, when i took the hubs off to work on them, the axleshaft moved in and out about the same amount, and also side to side a bit. i was worried about this, but my dad claims its always like that. have put ~2,000 miles since then and no problems, 4x4 shifts fine.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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