Stop in for a cup of coffee

I have been under a few vehicles running up to and beyond 60 mph. Diffs are noisy when they arent under load. Scary too, when asshole boss holds it to floor.I have a tool, chassis ear. Microphones on clamps and leads go into cab. They plug in a box, selectable and listen through headphones. Can hear brake pads riding on rotors. Sensetive enough.
yeah.. it actually got quieter when i removed the drums.. i had them held on with 2 lugs. I'm pretty sure it's the ring/pinion rubberbanding and making the driveshaft make noise.. it's 3.5" steel and rings if you tap it. i'm way too paranoid... i can put the seats in and see if it moves next.. i need to look into insurance/plates for historical cars in mich