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Old 07-24-2012, 08:37 PM   #1
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What can be causing a high-speed shudder ??

I have a 27-foot Fleetwood Flair with a 454 (see sig).

She drives nice and smooth all the way up to 74 mph. But at above 75, she shudders and shakes, not unlike being in a house that was hit by an earthquake.

So my question is, is it normal for MHs like mine to do this at high speed ?? If not, what could be causing mine to shudder ??



(Note: If I'm carrying a full load of water (75 gallons, iirc), it doesn't do it)
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Old 07-24-2012, 09:02 PM   #2
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Not normal. Tires are the usual suspects with vibration. Unv joints. alignment. When you let off the gas does the vibration change? How new are the tires? If your tires are old, changing them might eliminate your vibration or set cruise at 74 and forget about it
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Old 07-24-2012, 10:10 PM   #3
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U-Joint vibration occurs more at low speeds. Front end alignment does not cause a shudder or vibration. Tires being out of balance normally shows up at a lower speed that is resonant to the size of the tire. I would be very suspect of air dumping out of the motor compartment at that speed and causing buffetting. Most anything mechanical would have shown up at a lower speed.
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Old 07-24-2012, 10:35 PM   #4
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I think we've covered the basics...wheel issues, incl: tire balancing, tire flat spots, wheel trueness, driveshaft unbalance. Other issues to look out for might be a bad motor/trans mount. Air buffeting seems like a long shot, unless something has been modified, therefore changing how air flows under the unit.
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Old 07-25-2012, 08:20 AM   #5
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Don't rule out the tires which are the most common cause of vibration. you can rotate them to see if that changes anything. There are so many different problems you can have with a tire, you cant predict what speed the vibration will occur.
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Old 07-25-2012, 10:03 AM   #6
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Don't rule out the tires which are the most common cause of vibration. you can rotate them to see if that changes anything. There are so many different problems you can have with a tire, you cant predict what speed the vibration will occur.
X2

Sounds like the tires to me too.
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Old 07-25-2012, 11:41 AM   #7
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Personally, I wouldn't drive 75.
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Old 07-25-2012, 12:56 PM   #8
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cue Sammy Hagar...."I can't drive, 75!!!!!"

maybe stick to 55 like Sammy says
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Old 07-25-2012, 01:33 PM   #9
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Is it a constant shake that increases with more speed or does it 'come and go' like building up to real bad, then smooths for a few, the starts to build?

The former is driveshaft/u-joint/one tire issue, the latter is usually 2 or more tires (going in and out of synch)
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Old 07-25-2012, 01:36 PM   #10
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Personally, I wouldn't drive 75.
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Old 07-25-2012, 02:02 PM   #11
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Quote:
Originally Posted by Peacekeeper6 View Post
I have a 27-foot Fleetwood Flair with a 454 (see sig).

She drives nice and smooth all the way up to 74 mph. But at above 75, she shudders and shakes, not unlike being in a house that was hit by an earthquake.

So my question is, is it normal for MHs like mine to do this at high speed ?? If not, what could be causing mine to shudder ??



(Note: If I'm carrying a full load of water (75 gallons, iirc), it doesn't do it)



This sure reminds me of an annoying speed/weight vibration one of my previous rigs had... Long story short, caused by an out of round drive tire. I had all of the tires shaved o trued to round (cheaper than replacing them) and she rolled like marbles on glass.

Side note: With anything bigger than an ordinary car, my personal speed limit is 65mph. Don't care how high the posted limit may be. One can't argue with the physics. Fuel consumption, tire wear, stopping distance, etc all go up dramatically at speed beyond 60mph or so. Besides that, just experience a steer axle tire blowout above 70mph and it will make ya a believer. It isn't worth it....
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Old 07-25-2012, 02:49 PM   #12
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It's the pre self destruct warning.
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Old 07-25-2012, 04:39 PM   #13
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Quote:
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Personally, I wouldn't drive 75.
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It's the pre self destruct warning.
To all the faint of heart.............
The man wants to fix a vibration not get advice on what his max speed should be. He's from Nevada with lots of empty, long roads. If he were to putt along like he is in the East, he will start collecting Social Security before he ever reaches his destination.
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Old 07-25-2012, 04:59 PM   #14
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Thanks for the replies everyone !!

To answer the questions, the shuddering INCREASES as speed increases.

I don't usually drive so fast. My cruise is usually set at 50 or 55, even 60 if the road is loooong, flat and boooring.

I just wanted to find out the top speed of my rig at the time I noticed it.

I'll probably just live with it up until I buy new tires. It's really a non-issue at "turtle" speeds I usually drive in.
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