I have a 2013 xf 1100 turbo sno pro sled. I went to back the sled up today. I put it in reverse then slowly pressed the gas like I always do when in reverse and it started to back up for a second then all I heard was grinding. So me and my buddy pulled the sled backwards where I needed to go. Put it in reverse again and slowly pressed the gas and it backed up a few feet without any issues. So I drove it home went to back it in the garage and the same thing happened. I tried a second time with the same result. Then the third time It backed up without grinding. First off I dont know much about mechanics so what is that grinding sound Im hearing? Second I called my dealer and he told me I need to bring it in and have it looked at because if there is pieces of metal floating around from being damaged that it could affect me going forward also. I asked if it would be covered under warranty if something was broke in there. He told me if it looks like the gears were tore up and ground off that warranty wouldnt cover it because that would supposdly be "my fault". Ive had this thing in reverse maybe a dozen times since ive owned it and I baby the gas when in reverse. I will be one pissed off guy if they wont cover it under warranty because I sure as shit didnt do anything to make the reverse stop working.