My car has a low frequency rhythmic rumble that starts at around 65 mph. The cycle is about a 3 second interval. Comes in and Fades out. As the speed increases to 75 mph the cycle drops to about 2 second interval with a little more intensity. No shimmy or vibration in the steering wheel. No loss of vehicle handling characteristics. Sounds like it's coming from the engine compartment, I suspect bad motor mounts. I am also thinking about driveshaft imbalance.
Does anybody think they might know what the problem is or could help me troubleshoot this issue?
1979 Ford Thunderbird 351, fmx trans, low rhythmic rumble at high speeds
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