G56 rebuild issues
 

Hello. I just had my G56 rebuilt in my 2008 Ram 2500. Prior to the rebuild I had grinding going on and blah blah blah. One of the issues that I had prior to rebuild was crickets/vibrating noise in 5th and 6th gear at higher speeds. Just got the truck back today and all is well with it except the fact that the crickets/vibrating noise is still there in both 5th and 6th! I was told they did a full rebuild on it and I have the reciepts to prove it. What is the issue and why does it do that/make that sound? Truck Is going back into the shop on Monday but I want to tell them to look for something that maybe they missed? I was also told the noise is normal after a rebuild but why would my noise be there before my rebuild?