Normal
I moved from a 35 gen 3 with the verified clunk (I was waiting on parts until I traded it in) to a 37pp with the clunk again. If I was a betting man I would say that nearly all of these truck have the cluck from a certain time frame it just depends if the owners notice it or not. Some people will drive a week on a flat without even knowing it so I can only assume many just don't notice.