Vibration Problem After Clunk Fixed

[pbvhome]

Hello,

I have bought 06 GX470 a year ago and recently fixed clunk issue (drive line changed). Since then when I drive (accelerate to hight speed in high ways or in up hills where you expect drive line to be engaged) - I sense a vibration that drive line operation is not a smooth feeling (as it used to be). In other words it is kind of whirring noise as you step on to the accelerator.

Though I don't sense vibration in steering wheel itself - it is certainly there at drive line level. When i drive up hills (I live in valley) It creates a noticeable noise and then vehicle picked up to full speed noise/vibration level reduces. Also it goes away if i take my foot off accelerator.

I read through many posts (those are old in year 03-05 range) and most of them indicate "lexus aware of problem and no fix yet (as of that time)". Is there a fix now from Lexus for this ? I haven't approached the dealer yet but soon planning to.

Let me know any suggestions to better describe the problem to dealer (as they always try to refuse the issue in the beginning) and get this addressed.