Many more years ago than seems reasonable, I had a noise in my CJ5 jeep. Kind of a scraping, grinding sound. Could not find it. I used to tie a few castnets in those days, so I knew my way around knots. Being young and immortal, I basically built a sling or hammock under the Jeep. Slid in it, and had my buddy drive slowly across a smooth paved parking lot.
Perfectly safe, plenty of ground clearance, not close to the tires, knew I could trust my friend.
Heard the noise, but was facing the wrong way. Got the Jeep stopped, slid out, turned around and slid back in. Noise was right in front of my nose. Speedometer cable was scrubbing in its sleeve. Took it apart and lubed it. Problem solved.
Told that story for years. Got lots of comments.
About 10 years later, heard about a guy on the news who owned a big diesel dump truck and had a noise of some kind. Don’t know what it sounded like. He climbed under the truck and got a guy who worked for him to drive across the parking lot.
Driver got to the end, stopped and got out to ask him what he found.
Found the guy wrapped really tightly around the driveshaft.
Just saying.
J.