Your Humble Administrator
I've never heard the coupler noise because my RAV4 V6 is FWD. But I'm very familiar with the transmission whine. At 40 mph it was very noticeable, but when I took my foot off of the accelerator pedal, it would go away. Get back on the accelerator to maintain speed, and it would come back. Mine started doing it around 19K miles. The dealership replaced the transmission with the new "H" version, and with 64K miles now the noise has never come back.Is this a completely separate issue to the common transmission whine? It appears my 2011 is still under a extended warranty through Toyota for this rear diff but they said it was my transmission. Any easy way to tell which drivetrain issue is which? My noise I can hear quietly even from start and then it gets far more noticeable around 38mph up to 60mph then I think wind/ road noise hides it. It sounds like a quieter 4x4 4LOW sound.