2000 Landcruiser weird vibration when I let go of gas at high speed

[hksnlper]

2000 Landcruiser
293k miles

It all started last week. While driving down the freeway I noticed a slight vibration at high speed when I let go of gas peddle. I figured may be its time to change tires. I took it into discount and changed all 4 tires out. That did not help. Any suggestion guys?

 

[TheForger]

When was the last time you replaced your steering rack? When you let off the gas and are holding the steering wheel, can you feel the vibrations in the wheel itself? Possibly even a vibration that extends down through the steering column and shaft?

 

[re_guderian]

How high is high? Alignment, wheel bearings loose, where do you hear/feel this vibration?

 

[Bardiya]

Again, Driveshaft universal joints.
Check the play on all 4 and grease the joints and slip yolks with a grease gun.

 

[hksnlper]

To answer a few questions

U joints were replaced last august I always grease them every other month.
Alignment was done right after I replaced the tires about 200 miles and he went through the entire suspension and did not find any issues.
Steering rack was replaced in October 2015

No vibration in steering wheel. I only feel it in the body

 

[DirtDawg]

I would inspect motor/transmission mounts and front diff mount bushings.