I had a Motor Trike reverse installed on my 2010 ultra classic. It makes a terrible rattling noise when you back up then pull the clutch in. Some times I hear a loud clunk when I put it in reverse, if I hear the clunk then the rattle is not there. They told me there is nothing wrong and it will not hurt anything. I was raised a mechanic and always was of the opinion that a rattling noise from gears means something is not meshing right and metal was being chipped off. I don't want a bunch of metal shavings in my transmission, they will destroy it. Has anyone had this problem or am I just worrying too much.