1958 M274

Mine used to make a pretty good pop in the right front too. You could feel it with your feet when it let go if you were sitting in the passenger seat. I was worried about it at first, but determined that it was where the coil spring in the right front suspension fit up into the socket on the body. It was binding in there, maybe yours is too. I greased the area where the spring was obviously rubbing inside the socket when the suspension flexed and that made it a lot better. It still does it occasionally but not nearly as bad. I try to remember to put a little grease up in there every now and then. Hope this helps!