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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'98 Oldsmobile Bravada, High speed Vibration

Q: I recently purchased a ‘98 Oldsmobile Bravada. On a long distance trip, I noticed a significant vibration in the dashboard from 55 to 65 mph. When I arrived at my destination, I took the vehicle in for a look-over. Nothing was found as to the reason for such a display. I have had multiple people tell me to get the front end aligned; I have had the tires balanced. The drive train was checked, is there anything else I can do?

- Tim

A: I doubt an alignment will correct the condition. Why? The complaint you have is speed related. When speed is the factor you have to look at what parts of the vehicle are spinning, example the tires, drive axles and drive shaft. Because the tires and rims have the greatest amount of mass that is rotating, they’re suspect from the start. It only takes 1 oz. of imbalance to cause a vibration or shake to be noticed at those vehicle speeds. If the balance is correct then look closely at the tire and rim condition. There is not a tire balancer made that can correct for worn or cupped tires, or a rim that is bent or damaged in some way. It does not take much of a ding on the edge of a rim to cause a tire to not run true to the road. A common problem we see in our snowy region is due to rims that are bent. When the vehicle slides on the ice and then bumps into a curb or hard snow bank, the vehicle will not look to be damaged but the side load of the impact can bend the rim just enough to cause a shake that can never be balanced out. A closer inspection of the rims and tires may provide the answer.

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