FordExcursions.com Forums
aobrien
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• Winchester, VA, USA |
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• Registered on 6/3/2005 |
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• 30 posts |
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 Posted:10/4/2006 07:21 |
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I have always rotated and balanced my tires at every oil change in order to maximize ride comfort and tire life. Sunday I noticed a slight shimmy in the rear-end during some highway running and lastnight I noticed cupping on both rear tires; no cupping on fronts. It's not bad, yet, but it's noticeable...every 4 inches or so there is a low spot (dip) that goes around the entire tire about 1/3 of the way in from the outside of the tire edge.
I checked my maintenance log and I did my shocks about 25K miles ago. Wheel bearings are fine as far as I know and tires were rotated a mere 4K miles ago. Any thoughts or ideas as to what the most likely culprit(s) is? Thanks.
Andy
2000, V10, 4X4, 91K miles |
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CHPMustang
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• Plano, TX, USA |
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• Registered on 7/24/2002 |
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• 1,800 posts |
• 1 Vehicle
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Posted:10/4/2006 14:33 |
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An out of spec alignment will cause cupping and so will crabbing which is when the rear tires aren't tracking with the front tires in a straight fashion.
Bill
2002 Excursion XLT-P 4x4 7.3L Powerstroke Diesel
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aobrien
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• Winchester, VA, USA |
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• Registered on 6/3/2005 |
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• 30 posts |
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Posted:10/7/2006 09:39 |
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As a follow-up. I took it to the local tire shop to let them have a look at it. They gave the suspension the once over and said it was mint, no issues. They road tested it and could feel the same vibration in the rear-end that I was feeling at highway speed. They did a "road force balance" on all four tires, which is a balancing of the tire/wheel assembly under load and found that all four were "out of spec" - whatever that means. What a change in ride, I'll tell you. The beast has never been smoother and although they want me back in 3,000 miles for a look-see, they suspect the issue has been solved. If you've never had road force balancing done give it some consideration because it dramatically improved the ride at highway speeds. |
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CHPMustang
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• Plano, TX, USA |
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• Registered on 7/24/2002 |
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• 1,800 posts |
• 1 Vehicle
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Posted:10/7/2006 13:35 |
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What make,model,size tires that was giving you the issues and what did you replace them with?
Bill
2002 Excursion XLT-P 4x4 7.3L Powerstroke Diesel
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aobrien
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• Winchester, VA, USA |
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• Registered on 6/3/2005 |
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• 30 posts |
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Posted:10/8/2006 08:19 |
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Bill, the tires were not replaced. I'm running 265/75/16 Bridgestone Rugged Trail T/A. The road force balance offsets the imperfections in both balance and roundness of the tire and wheel in unison...SMOOTH. |
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