Question about 2006 Ford F 350 Super Duty

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Whole truck will shake intermittently at various speeds

I own a 2006 Ford F 350 Crew Cab 4wd with 20 " wheel/tire package. I bought this truck brand new with the wheels/tires from Ford this way. At random speeds the whole truck starts shaking like it is a freezing cold person. The dealer has balanced the tires and changed a torsion bar and a stabilizer bar. No difference in ride quality. It might also be noted that when it is riding ok, the least little bump or indifference in the road surface will set it off also. The truck will be three years old this July 23, 2008 and it has 20,646 miles on it.

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  • motor6 Sep 11, 2008

    Gary In Police Dept. We have a 2006 F-350 that will shake like the tires are falling off when hitting bumps at approx 65mph. It has been to ford 4 times. They have tried everything , even adding a ranchero double stabalizer shock. problem still there just less often, now the stearing is messed up. real tight all over road. back to ford for fifth time i guess.

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I bought a 2006 F350 crew cab 4x4 and had the exact problems explained here. I have 20 inch wheels and had BF Goodrich TA Radials.( From the dealership ) It shaked when hitting bumps especially going around corners... I switched to 35" Toyos.. no change. I had the truck in several times in which they changed the track bar and aligned and ballance ...etc.. ugh. What i found out is that the dealer installed a 2" leveling kit. this makes it sit straight and looks nice with the 20" rims. The leveling kit is basically a cup that sits on top of the front coil springs. This 2" difference messes up the geometry of the front end and gives you the "Death Shake" If you have this and you like the way your truck sits, you would be better off buying a small lift for the truck which retains the stock position of all the front end. I put a 6" lift on my truck and have run it through two sets of tires without ANY instances of the shake once the lift was installed. I have even ran severly cupped tires in front with NO shake.. I currently have 74K.

Posted on Sep 19, 2008

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Hi JeffM123,

I had a similar problem with my Blazer.
Whole truck will shake intermittently at various s - 27ce2c1.jpg
Those are 42" Super Swamper TSL's. Six of them. All professionally mounted and balanced.

There are four shocks on the steering stabilizer.
Three shocks on each front wheel and two on each back wheel.
14 all together. And at times it could still shake your teeth out.

Why?
Every once in a while (more often than I like) the treads of all the wheels are in the nearly the same position (for lack of a better term, rotationally synchronized). No big deal in itself.

At a certain range of speeds (there was an upper limit that it stopped) which would vary by type of road, they would start to generate a harmonic resonance.

It would start as a hum, then vibrate, then start some serious shaking. It was setting off car alarms at the mall.

Sometimes, while cruising at hum speed, I'd hit a pothole or rock in the road. That would skip the vibrate phase and trigger the shakes without warning.

  • If I slowed down, it would stop.
  • If I nailed it and got past the upper range (bounce barrier) before parts started flying off, it would stop.
  • If I increased the tire pressure, the shaking wouldn't start until a much higher speed was reached.
  • If I decreased the tire pressure, the shaking pretty much ceased completely. It also made my already unimpressive mileage plummet even worse.
  • The easiest solution turned out to be turning or changing lanes. During any turn, the front wheels travel a different distance than the rear wheels and from each other. This brought them out of sync (for a while) and stopped the resonance.
How this may relate:

You mentioned a 20" wheel/tire package.

What kind of tires? Are they strictly highway or are they of a more aggressive nature?

They don't need to have fist sized lugs to resonate.

Let me know if my description sounds/feels like what you're experiencing. If so, forward make/model of your tires. I can check for similar occurrences, histories and most importantly, other solutions.

Hope this will help

Mike

Posted on Jul 27, 2008

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Have your tyres inspected from a tyre shop they could be faulty your dealer ship would not admit to this failing that they should be able to point you in the right direction

Posted on Jun 03, 2008

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