Can you find the noise makeing spots? in Yuki's FN, his pan rattled against the bottom of the cage, but fleece inbetween took care of that. If you can find whats causeing the noise and either tighten parts or put fabric inbetween it may help.
Yuki came with a wheel that hadn't been in his cage because he was in a bedroom near people sleeping, and putting it back in was about the first thing I did. He was so happy he jumped into the wheel while it was horizontal and I was still getting it through the cage door. (This was while I was still a scary unknown person, but there was no way he was missing another second of his wheel). We fixed it on while he was trying to run on it.