Whining noise

[Yeronga]

I just took delivery of my grenadier and when driving I noticed a whining noise when letting off the throttle, is this normal ?

I have a transmission whine between 80- 95 kmh (50 to 57mph) when the transmission is NOT under and extra load. Accelerating or decelerating eliminates the noise (to my impaired hearing) and it is not there at higher speeds (possibly as the engine and transmission is ALWAYS under load at higher speeds). It is not turbo nor tyre noise.