Ummmm... you DO realize thread titles can be changed by the original poster, don’t you? Because I swear it was titled “PN for rear differential drain plug” at first and was changed but like I said, maybe not. That’s why I asked @new2yukon but he still hasn’t answered....Mark, Mark, Mark, Mark, Mark, Mark, Mark, Mark, Mark.....the thread title. Usually it is this old guy, 67, not reading correctly. I don't feel so old now. Thanks!