i just bought an 04 excursion with the 6.0 diesel. i took a trip to vegas and noticed a humming/ vibration about 55-65mph only in overdrive. i have checked u joints and they look good . the x does have a small lift its the bracket kit with stock springs. what gets me is i dont notice it driving in town only in overdrive at highway speed any help would be greatas im new to the ford world thank you

 

On all types of highway surfaces?
I get a hum on one stretch of concrete interstate in orlando.

Sent from my Sprint PC36100 using IB AutoGroup

 

Does it have aftermarket exhaust? and the kitty? I have 4 " MRBP kit and I get a drone at highway speeds.

 

What about higher speed? On I-15 California or Nevada side that the humming happen?

 

Yeah it's got 4" exhaust with only a cat. It does it on all surfaces. It's more than an exhaust drone I can feel it in the whole truck. To me it feels just like a driveline vibration but only in overdrive doesn't make since to me.

 

If this has a two piece driveshaft take a look at the carrier bearing for play. alot of times when people lift these trucks they dont take into consideration the driveshaft angles. If the bearing is not bad it might just need to be shimmed down to improve drive angles.

Also if bearing was replaced previously the driveshaft might of not been reinstalled properly and its causing the vibration.

I recently had this issue and same symptoms.

 

How do you get a Torqueshift into overdrive?

I'm guessing you mean when it reaches the 5th gear. I would not rule out exhaust or drone. You'd be surprised how you can feel harmonic vibrations. If you use Tow Haul mode and don't get fast enough for it to shift into the 5th gear, probably in the mid 50's, if you don't feel it, but then shift into the 5th gear and you do, and at the same speeds I'd think you have a drone or harmonic issue going on. Driveline issues won't usually change at constant speeds.

 

Does the vibration go away if you go over 65mph? Does it stay constant or get worse?

 

It has a one piece driveline. And yes I guess it's 5th gear lol. It won't do it in 4th gear. If I go over 65 it goes away.