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They wear when that shaft turns. Leave the hubs unlocked and stay in 2wd, you can drive it til it falls apart and they won't get any worse. Depends on how soon you want to do your axle swap too, I'm sure you could probably get away wtih a few more runs without killing it. Not something I can judge and say go/nogo to over the web, sorry. All I can say for sure is it's not supposed to be like that.