4.34runner88

I know this is a Toyota site I own both my 4runner and chevy 1500 I need help with my chevy im sure someone here has had the same chevy issue and it might have happened to one of your Toyota pickups. in the pics if you look close you can see the cab and bed don't align I have checked the body mounts and they look fine the cab and frame are straight I don't see any sag. I took the bed off and ground down some rust spots after I removed the bed and reinstalled it and it still looks the same and slightly dropped the back down a little barely notice unless you have seen it tone. it does have a lift on it from when I got it. if anyone has any idea plz help I hate the look and the frame didn't seem to have and stress marks either hopefully one of you know what has happened and there is no sign of a rear end hit. the bed isn't tilted or jarred to one side or the other just ass high and even across when you look at it from behind plz help. any ideas will help with the issue