I think this is transmission, but it's just an educated guess so mods please move as necessary.
While accelerating sometimes my car makes a whirring sound similar to an electric motor. It sounds like a blower at times, though somewhat quieter and generally goes away at higher rpms. The sound follows the rpms in intensity while accelerating, but doesn't do this all the time, though it has become more frequent as have some of my other transmission issues lately.

Trans fluid is full, though it looks like used oil. Filter change coming soon, but I'd like to know if this is a sign of a bigger problem or if it's just normal.