04 Expedition Vibration

[chasineyes]

Looking for some advice on where to start looking...My 04 Expedition (with 134,000 miles) develops some vibration issues above 60 MPH. They will start for a couple miles then go away, then start again, then go away. It gets worse and worse above 70.

With that being said, I have replaced the front brakes, calipers and rotors. I am not noticing any "steering wheel" vibration. I also tried shifting it in/out of gear to see if that causes it go away and it doesn't.

I was going to check the rear brake system next. Could it maybe be a wheel bearing or something more expensive in the transmission? I might also get under and try moving/wiggling the u-joints. Any advice on where I should continue my searching???

Thanks!

[brittman]

If you have a tire(s) out of balance the Expedition will vibrate at higher speeds.

If you do not believe you have lost a tire balance weight, then it could be

something as simple as dried mud on the inside of the rims.

[fishing tech]

If it comes and goes I would guess maybe a ignition coil or engine miss. 5.4L engine? Does it idle rough?

[luckycrank]

It is my opinion that tire vibration above 55 are speed specifi. For example they may occur at 60 -65 but diminish or completly dissapear above or below that brake rotor pulsations almost alway increase with speed, unless present at low speeds also .. but brake rotor unbalance usually dimishes after it appears. Driveline vibrations get worse with speed also i have seen cheap.rotors cause vibrations ..due to unbalance even when new

[chasineyes]

A little update...I should have clarified that it was "shuttering/vibrating" when I was pulling the trailer home on Sunday. However, yesterday driving it to work it drove GREAT! At all speds on the highway. It has yet to have an aligment and balance so I think I will have that done this weekend. Otherwise the truck runs great!!

Thanks!!!

[Jeremy airjer W]

Have you looked over the trailer tires?

I have pulled trailers with both bad tires and less than desirable wheel bearings and have felt the vibrations in the truck.

Brakes will only cause a vibration when applied a less a caliper or wheel cinder is frozen. If that was the case you would be able to smell hot brakes and see the smoke rolling from them when you stopped.

[Surface Tension]

How much did the trailer squat the truck.

The load changes the angle at the u joints and a vibration shows up.

Had that happen with no other indication the of a bad u joint. No clunk when putting into gear, no squeak or vibration under no load.