Bad, bad, bad...bad vibrations

[fallguy]

At about 73 mph a vibration started under the truck...vibrated the whole cab. Ok at 70 and ok at 75...thoughts?

New rubber & rims a month ago with alignment & wheels balanced.

 

[bucket]

Lost a wheel weight? I'd start with balancing the tires again.

 

[crazy4offroad]

Check the driveshaft u-joints, if it has a faster phase vibration than what would seem to be a tire.

 

[philjafo]

I had a vibration like that once, turned out to be a broken transmission mount.

 

[cooter55]

Check your center support bearing as well as your u-joints.

 

[HotRodPC]

That sounds like a tire out of balance. On 4x4's if you have bad front leaf spring bushings, that tire vibration is amplified severely and you'd think the whole damn truck is coming apart. What makes me say tire balance, is that it comes on at certain speed, then goes away at a certain speed. I have a truck I can't drive 68-73. I either drive it 65 or 75, cuz at 70 it's shaking the steering wheel.