Quote Originally Posted by jimithng23 View Post
Upon initial installation of the XO1 I had a nasty creak/groan coming from somewhere in the driveline.

Turns out it was the cassette carrier. I removed the cassette, greased the threads on the XD driver on the hub, and slathered grease in where that carrier made contact with the cassette.

Initially, this didn't fix the problem. I just said f it and went for a ride anyway. The noise went away almost immediately; grease must've just worked itself in there.
A little grease does wonders.