vIbration / hum at speed


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By Marc - 13 Years Ago
The old truck (60-F100, 292 4-speed) has developed a weird noise. At around 55 mph, I can hear & feel a rhythmic "vrum-vrum-vrum-vrum", which is more pronounced under a load, like when climbing a hill. It doesn't show up until that speed, and goes away as I approach 60.

Was thinking driveshaft needs to be balanced, or maybe just have a bad u-joint. Any thoughts?

By Talkwrench - 13 Years Ago
Mine does something similar at around 60.. Sounds like a diesel boat, just the exhaust drone I assumed as I have short glasspacks nothing else.
By Ted - 13 Years Ago
Could be several things.  U-joint, axle bearing, pinion bearing, transmission bearing, and others all come to mind.
By Hoosier Hurricane - 13 Years Ago
Don't rule out tires.
By Marc - 13 Years Ago
Hadn't thought about tires, but it wouldn't hurt to check them. I'll add that and u-joints to the list of things to do over the winter.