Whenever i reverse there seems to be a squeal coming from the rear of the truck. It seems to squeal at a faster pace as the truck moves faster as well. This problem only happens in reverse, any ideas?

 

You know I had that same problem with my truck when I first bought it. Thing was it would really squeal when I went back into first but then would go away within feet of where I was. I figured the parking brake was sticking slightly so I just engaged it and released and all is well.