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Old 05-27-2013, 05:20 PM   #1
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Rear shimmy and shake at 50+ mph

Need some help from the experts here. This Friday and today was the first extended trip (2.5 hours each way) with our 03 Chateau Sport 26Q weighing about 11,500lbs.

Last month I installed my valve extenders on my duals and found them to be at 90lbs (max should be 80) and dropped all 4 to max air. I have the fronts set at 75lbs. Never felt any shimmy or shake before this trip. I would only really notice it at 50+ mph. No affect on the front. Just made for an uncomfortable ride. We are leaving in 3 weeks for a 5 weeks trip and I want to fix this.

I was thinking that my rear duals may be out of balance or some other problem. Just need an idea of where to start.


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Old 05-27-2013, 05:36 PM   #2
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We don't know the service history but here's where I'd start. You could take it for a short drive and have somebody watch from each side and from the rear to determine if anything out of thr ordinary or weird is going on. There may be something obvious that can be seen. If that yields nothing then I would jacki up one side. Spin the tires and try to observe any unusual movement as far as out of round side to side etc. Then removing the rear tires and perform a visual inspection. Sometimes a problem will show up. It might be a shifted or separated cord. Slowly roll each tire and observe the tread pattern all across the surface. A shifted cord will show up as a movement or shift of the tread as you roll the tire. Check for bulges of the tread or side walls. Sometimes a ply will separate and allow air to enter. this causes a bulge in the tread. Maybe you lost a weight. That would be observed if you notice a spot where a weight was and it's now gone. If nothing shows up have all tires balanced. It's always good to start there. That said you do have to find a quality shop that will perform and guarantee the balance. When you take it in have somebody go with you to observe for themselves what you experienced. It's always best when they can feel the issue as well as you. That's where I'd start.


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Old 05-28-2013, 05:06 AM   #3
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Since you adjusted the pressure in the rears I'd start with getting a good tire shop to take them off and check them, including a high speed balance. That should quickly show ant issues with them.

It certainly sounds to me like a belt slipped or tread separated.
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Old 05-28-2013, 05:26 AM   #4
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If you removed the duals to install the valve extensions you might want to back track to check that the wheels were seated square and lug nuts we're tightened to proper specs. Jim
Jim/Lois 1999 Newmar Mountain Aire MACA3797 F53 - V10
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