vibration at certain speed

[MacDougall]

Okay so when i hit a certain speed (45-55 MPH ) my truck will start to vibrate, if i look at the driver side mirror i can hardly see anything because it is shaking so much. and you can feel the stearing wheel shake, and a few things start to rattle inside the truck. once i get a little over 55 mph it will stop or if im under 45 it stops. Its starting to drive me nuts and i dont know what it would be, i checked the carrier bearing thinking maybe its that but that is fine. any ideas?

Oh and its a 2002 crewcab long bed 4X4, if that helps at all

[regans5]

Tires out of balance??? Did this just all of a sudden start or has it gradually gotten worse? What shape are your tires in? Could have broke a belt in your tire if they are old. Did you hit a big pothole or anything like that? Try rotating your tires front to back and see if the vibration seems to go to the rear. Did you look for any missing balance weights you may have thrown off or rubbed off? Any more info might be helpful.

[STANGMAN893]

There was a TSB from Ford on a vibration in the driveline.Basiclly they would shim the carrier til it went away.Could be that or maybe a bad u-joint.

[06reddragon]

Sounds like exactly what mine was doing last month. Except mine was from 50-60mph. Ended up being a bad u-joint.

Mine came on all of the sudden too. Drove me nuts. Mine was worse when you accelerated past 60mph then coasted down to 50. As long as i was picking up speed i didnt notice it too bad, but as soon as i let off i felt it.

[T444E-Twinturbo]

That arrives sometimes with hardened mud , snow or stuck ice interior side of the rims

[mbahr22250]

It really sound like a tire issue to me. Especially if your feeling it real bad in the steering wheel. Like regans5 said, try rotating them and see if it helps take it away from the front end.

[symbols]

I feel your pain. Mine does it from 62-66 mph. Since it started I've replaced all u-joints, carrier bearing, transfer case (it was actually cheaper to get a used transfer case than the output shaft bearing at the time), transmission, and tires. I've put the truck up on jack stands and brought it up to speed and it wouldn't do it. I have no idea what is causing it but I hate it and it drives me nuts as well.

[Nick]

This is just and idea, but has one check the drag link to ensure that the bushing are not bad. I have a problem with a vibration and after doing a lot of looking around my drag link bushings were bad. I replaced them did a ball joint job it needed to be done, and it rides smooth. I am not sure if this will work other, but I just wanted to post an idea to help. Thanks

[T444E-Twinturbo]

Another idea, can that come from the bearings in the rear end or "C" clips

[Jarrod B]

i have that but its a slight one and around the same speed. but the funny think is that it doesnt happen always. mine happens when going down hill or not having the normal weight on the drivetrain.




btw is this the same MacDougall that had the red obs that was in the obs chat?