noisey transmission 18spd

Well looking for someone that can tell me what going on here. Transmission is brand new eaton 18spd. When i step on the clutch and put truck into gear all is ok but when i release the clutch and i dont apply any throttle and just let the truck crawl or if i loaded and and ground is soft as i move there is alot of noise coming out of the trans. Its quiet after you get it rolling and temperature seems steady at 200 degrees all day. I first thought it was the release bearing but it made this sound with the old trans just not as loud or as bad. Seems to be getting worst but cant find anything. Did a plug swap on trans and it was clean. The truck has a Cummins ISX 565 if it matters. My 34 yrs of running Cat motors i never heard crap like this. Anyone hear of this noise problem before. What was it and what the renedy to fix it. Thanks in advance

 

brand new

 

i am trying to find a brand new truck that i can look at the linkage and swivels on the linkage to see how tight they are for comparison

 

The shop is wanting me to pull the trans so they can inspect it and then send it back to eaton. If they take it apart and find nothing wrong then i pay for everything including labor and oil

 

Yes thats EXACTLY what mine is doing

 

Hell there is a big difference in the teeth not much for tooth on the new ons