i dont know what the sound is mate but, my 07 250 MT like 3k as well (for eco) and in 6th im at around 120 km/h (if i remember that's what ~55 mph right?). and i dont have a link. sorry i cant help more, or any really lol.
I was driving on the highway couple of days ago and when i went from 6th gear to neutral, the clutch went in and didnt have the same force comming out. I couldn't change to any gears afterwards. Had to pull over and tow my car about 150 KM to my house. Extremely frustrated with the car. I am not sure what is wrong with it, i think it's probably the clutch. Lexus wants to charge me 150 dollars an hour to diagnose the problem. I need to pay inorder to tow the car there. I only have powertrain warranty left and i am not sure if this issue will be covered by the warranty. If i have to change the clutch, i'll rather do it at the local mechanic shop than Lexus dealer ship.
Any suggestions??? I had the car for about a month, didn't buy it from the lexus dealership. I bought it from a private dealership, Bay Auto Zone in Toronto, Canada. I checked with them and they were not very helpful, they told me to get the problem diagnosed at Lexus, to see if the probles is covered under warranty. Currently I am 81 K, and the car is 06 MT.