Quote:
Originally Posted by SueTac
Did the alignment and all tires checked at Sullivan Tire, big truck tire place. Hit no potholes ...
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You state tires were “checked”, but were they balanced? Sounds like only the two front tires are in question. However, were they checked as in inspected for damage, or actually balanced?
What you are experiencing can be caused by a tire that’s not round (like broken belt as suggested by others), but most common problem is a tire that’s not balanced. The speed range you mention (62~69 MPH) is the front suspension’s natural frequency, so any tire problem is magnified.
My van’s front suspension worst speed is at 73~74 MPH, and when one of my front tires isn’t balanced correctly, it starts to shake at about 70, builds up at 73~74, and then disappears as I approach 80 MPH.
This kind of problem is magnified by poor shocks/dampers, but even new/good ones can’t correct for a bad tire or one that is significantly out of balance.
If shop did balance front tires in addition to alignment, then a more serious problem should be investigated.
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