I just bought a 1999 SC300.
The car has a pretty audible humming noise when driving in top gear. The problem doesn?t occur in gears 1-3 (almost quiet as a whisper) but comes up in 4th (4-spd automatic).
I pretty sure there is a problem with the CV joints already (there is a pop noise when I turn the wheel after coming out of reverse) but I don?t think these two are in anyway related.
Any suggestions on what this could be?