Aaron,
A frequency specific
Aaron,
A frequency specific vibration can be caused by a few things, with the driveshaft being a possible cause. I would start by carefully inspecing the rubber coupler...Any signs of cracking? A 360 degree view is essential.
-Driveshaft balance...Possible (see next step)
-U-joints...Loose or binding?
-Trannission mounts...Loose or deteriorated?
-Driveshaft alignment...
-Lastly, unlikely but possible, differential bearings...
This is the order in which I'd approach the problem. Hope this helps!
Regards,
David
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