Has the suspension ride height been altered? If not, you might start with having the ride height measured for sagged springs. Every tire and alignment shop has small books that list every vehicle, where to take the measurements, and what they should be.
Consider having an alignment specialist take the truck for a test-drive. They can tell by the frequency of the vibration whether it is vibrating at tire rotation speed or drive shaft speed. They will also observe if the vibration is felt more in the steering wheel or seat.
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Thursday, December 14th, 2017 AT 1:14 PM