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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 ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

'97 Ford F150, Tire Cupping

Q: My '97 Ford F150 extended cab with 97k miles is on its second set of tires. The second set of tires began cupping about 20k miles ago. A four wheel alignment was done with the new tires @ 60k miles. Tires are rotated faithfully every 6000-8000 miles. Could my shocks (original) be the problem? How do you know when your shocks are shot?

- Steve S.

A: If the tires are correctly balanced and the steering and suspension components are tight then it is very possible that the shocks on your vehicle need replacing. Shocks or struts for that matter do not have to be leaking to be bad. They can even pass the bounce test and still be bad. The valving, piston and cylinder inside a shock works hard. This hard work causes heat and the heat causes the oil in the shock to break down. This results in scarring of the cylinder and piston which causes a reduction in the absorbing abilities of the shock/strut. The valving and piston can be damaged from the vehicle's suspension bottoming out, like hitting a pot hole. The internal damage can never be seen. But when the shock/strut is working the hardest it can no longer perform. The result can be tire cupping problems. If all else is right install new shocks on all 4 corners of your vehicle. After 90+k your truck deserves it. I'll bet a coffee you'll feel the difference.

 
     
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