So I noticed this a while back, but I thought it was just something rattling. Today I noticed it and thought I would record the sound, by the time recorded, the trans was fully warm. The noise is more noticeable when the trans is cold. This in only while in reverse. I check fluid and level is good and no burnt smell. Trans operates without issue, shifts smooth as can be(better than my 8sp GM) Thoughts on what this could be?