7.3 squeal when accelerating under load
 

Hey guys. My truck has had this issue for awhile now. I don't tow much so it never is an issue but I was hauling my travel trailer and loaded down with my welder and tools in the bed. Something is whining or squeeling when accelerating mostly on hills and it doesn't do it all the time. Whenever it feels like it I guess. I did get a video. I'm going to try and upload or post a link.