Steering wheel shakes above 40mph, what could be wrong 2006 f250 4x4 crew cab stock tires and wheels 100,000 miles also not much response in steering above 55mph

Sounds like you need a wheel balance and alignment.

If you start to hear it about 30 - 40MPH and the noise changes if you steer to the left or right than it may be worth checking the wheel bearing.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

You may need your steering realigned, also, make sure you have your wheels bolted on straight. If those clear, get your spindles checked, along with your shocks.

The noise you hear can be several things. I would start with looking at the U-joints on the driveshaft and then the brake rotors. Next would be the tierods and wheel or hub bearings. Finally the tires may be out of balance.
Somewhere there is extra play that is allowing it to shake. If you drive about 10 miles an hour and ride the brakes with your hands off the wheel you may see the steering wheel move side to side. That would show the front rotors are out of round.

Most likely slight engine miss when engine is in overdrive on slight accel or load like small hills. replace plugs & wires & happy driving

First we need to know where is the shaking noise coming from?Is your car a 4X4?If noise comes from a driven wheel it can be the differential system or bearing also.Usually the speed you have specified is pointing to wheel alignment problem.Also can advice to go to a different tire shop and check wheel alignment again,also ask the mechanic to check the state of your wheels and tires.One of them may be damaged .

ball joints do you have fix a flt or slime in your tires or tie rod end

If you have replaced your stock size tires with oversize aftermarket tires and wheels (17 inch stock wheels to 22 inch wheels, etc) you need to have the computer reflashed to compensate for the larger tire size. Larger tires turn slower to maintain the same groundspeed, giving a false speed reading.

Check tire balance, rear wheel bearings and i would replace u joints front and back, anyway if they have never been repaced.

Hi JeffM123,

I had a similar problem with my Blazer.

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