So I've searched and can't find anyone else with this problem. I took my sequoia to the stealership and they said they can't hear anything. There is a high pitched whine coming from the front end only between 35 - 45 mph. It doesn't seem to change with the transmission, it definitely is speed related so it makes me think something in the driveline. I've replaced all the differential fluids and didn't see any issues. Any ideas? Is it a drive axle? Usually bearings have low frequency roars, this is a high pitched whine. I would love for someone to help me solve this! Thank you in advance.