Vibration and Noise Issue

Map63Vette said

It sounds kind of like cast metal scraping. I initially thought it might be the brake drums skimming the backing plates (the brakes were pulled from a different housing), but when I jacked the car up and let it run with the wheels off the ground it doesn't really sound like it's coming from the wheels and it's mostly speed based.

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Does it sound like when you were a kid and you taped a baseball card to your bicycle and it is hitting the spokes of the wheel? If so I had the same problem...pinion depth was off.

I have a problem now that sounds like your second problem...once I get to around 60-65 it sounds like something is loose or vibrating around? not sure what this problem is.