ArchHoagland
Clovis, CA, USA
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Joined: 11/28/2004
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SaintsFan asked
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Is it best to drive below 70 in a class A in general and not just for better gas mileage?
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Yes it is best to drive slower. Have you practiced a panic stop yet?
I guarantee you the day will come when you have to shut that rig down fast. It's best to know how it handles in a controlled enviroment.
As for the vibration I'd go back to where I bought the tires and ask to have them checked. More than once I have bought tires and they weren't balanced correctly.
I would also look at the sidewall and look for a speed statement. Some tires are stamped with the highest speed for which they are rated.
2004 Monaco
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2000 LEXUS RX300 FWD 22MPG 4020 LBS
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wa8yxm
Wherever I happen to park
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Joined: 07/04/2006
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There are two or three common causes of vibration
1: Tire balance.. They don't always balance them, you have to keep an eye on em to make sure they are balanced
2: Tire roundness. yes, they can be out of round, so can the rims
3: Suspension issues, bad ball joints or tie rod ends will cause vibration
This also applies to bad U-Joints on the drive shaft and "Other mechanical issues"
Nothin adds excitment like something that is none of your business
John is Near Kenwood TS-2000 housed in a 2005 Damon Intruder 377
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JFG
TN
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Feeling it in the back of the seat normally suggest rear wheel/tire problems. If they were balanced, it could be out of round tires or one or more warped wheels. A good tire shop can check for both.
Fred
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Tarheel 2
North Carolina
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Joined: 02/27/2005
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I vote also for bad U-joint. I had an identical problem and that was it.
Tarheel
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SaintsFan
Mobile, Alabama
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Joined: 10/02/2007
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This website and all of the people that visit are truly some of the finest people I have ever met. Thank you all for your input. I knew that this was the place to come with a question.
By the way, my chassis is a workhorse W22 with a 8.1L Vortec front mounted engine.
Thank you again.
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SteveRankin
Sequim, WA
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Like the other said - SLOW DOWN. While that coach may feel good to you at 70-something you'll find out in a big and very messy way that MH's don't stop very well and don't deal with panic maneuvers very well. Especially with zero experience behind the wheel. Another reason to slow down is that the likelihood of having a tire fail at high speed is very high. Not only is the coach more than a handful to drive with a blown front tire, the amount of damage a shredded 200# tire causes to the coach typically runs into the thousands of $$.
It's very common for truck tires to be mounted without balancing. Works OK at low & normal speeds, but at the high speeds you're driving you're going to find the weaknesses of the coach. Check the balancing first.
Steve & C. J.
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DonP
N-E-Where-USA
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One other thing that is possible and has not been mentioned! A tire may look out of round but: it may not have been mounted properly. If installed without enough or no lubricant the tire may pull to one side of the wheel, if you spin the wheel you will see that the tire looks out of round. There is a fine raised line in the tire about 1/4 inch out from the rim, measure that distance around the tire. If the tire has not been mounted a long time the bead can be broken and re mounted for the fix. A friend had this problem on a new coach that the tires had been on the chassis too long to reset. He was given 6 new tires.
Don
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jones4110
Champlin, MN
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I also agree with U joint suggestion and also you will need someone to check ride height which can also impact drive train vibration as well as wear. At least inspect and grease u joints. This type of vibration problem does vary with speed.
Joan and Bruce
05 Excursion 39L
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tahiti16
Camarillo, CA
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You said you replaced 4 tires, you don't have duals on the rear? If you do what 2 tires didn't you replace? Did ytou have them rebalanced? Oh and I agree with above on if the vibration is in the seat not thye wheel rear tires and driveleine most likely. Does the vibration change when you let up on the gas or press the gass? Not once it slows back down, just changing load on drive train, if so ujoints first!
Ray, Cheryl, Cory & of course Miss Molly the four-legged child
2006 Dolphin 36' F53 V10 6 speed auto 2 slides 7.5 KW genset
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sum1
So-Cal
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Joined: 11/07/2005
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As others have said, a "vibrating chair" type vibration that varies with vehicle speed regardless of engine RPM is likely a driveline issue. U-joints, center (hanger) bearing, bent/dented driveshaft, or mud caked on the driveshaft.
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