Annoying vibration above 65mph

[larkja]

Looking to troubleshoot. Here's what I have done in the past two months:

Right and left upper and lower control arms with new ball joints
Alignment
Tire rotation and balancing
Coil over conversion (removed air suspension front and rear - was sagging and losing air)

The steering wheel does not wobble which would indicate issues up front, and no shaking in the seat which would indicate issues in the back. I checked the driveline and the u-joints appear to be solid. Also had the truck inspected and they did not indicate any u-joint issues.

The truck is very smooth up until around 65mph. Any suggestions what might be causing a vibration? I'm running out of ideas.

Thanks

 

[Machete]

I had to go to three different places to get my tires balanced properly. One was the local dealer, nope. Went to my indy guy tells me a wheel is bent, nope.
Went to a 4x4 shop they told me wheel is fine that the previous balances were done incorrectly.

My truck was vibration free past 80mph.

 

[Fastcar]

Road force balance maybe. Does it continue beyond 65mph? Can you drive through the vibration or does it continue? Try shifting to neutral when you get the vibration.

 

[Machete]

Road force balance maybe. Does it continue beyond 65mph? Can you drive through the vibration or does it continue? Try shifting to neutral when you get the vibration.

At 65mph? I didn’t know you could do that. What happens when you put it back into drive at that speed?

 

[Machete]

Here’s what the 4x4 shop told me was done wrong.

The weights were all placed on the same side of the wheel vs on opposite sides.

In other words if you put a weight on the top of the wheel say 12’oclock then the next weight can’t be next to it or near it, it has to be at the 6’oclock or thereabouts position to counter balance the wheel.

 

[Fastcar]

Here’s what the 4x4 shop told me was done wrong.

The weights were all placed on the same side of the wheel vs on opposite sides.

In other words if you put a weight on the top of the wheel say 12’oclock then the next weight can’t be next to it or near it, it has to be at the 6’oclock or thereabouts position to counter balance the wheel.

I'd be more concerned as to the amount of weight rather what side of the wheel they are on. Most put them on the inside so they aren't as visible. Did the shop correct the problem?

If you can't feel the vibration under your ass or in the steering wheel, how did you determine there is a vibration?

 

[Fastcar]

At 65mph? I didn’t know you could do that. What happens when you put it back into drive at that speed?

You can, take your foot off the gas then shift to neutral, don't put it in reverse. The same thing that happens when you take your foot off the gas, you slow down.