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8

Probably not. The engine is going to be running faster than normal to make highway speeds in 3rd, if she got going fast enough it was probably pretty loud. Depending on the vehicle there may be a rev limiter to prevent the engine from running at too high a speed. Teach her to hear what the truck sounds like when it is time to shift if you can.


1

Since the tire change seems to be the onset of the problem, my first suspicion would be that one or more of the wheels aren't properly balanced. It's possible your mechanic's balancing machine isn't working correctly, or that one of the small weights placed on the wheel has fallen off. You may consider going to another shop and having them verify the ...



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