Very strange humming noise at 80 mph I've searched about this problem and ive read different things transmission bearing, also my rear tires are cupped and have flat spots not sure if that would cause the humming noise car is completely stock except for lowering springs any input would be greatly appreciated

 

Change your tires or rotate them if that doesn't work(allignment is important here), try changing tranny fluid, if that doesn't work check axles and the rest of the drivetrain.

 

Thanks I'm looking to get all new tires and alignment. Definitely will change my trans fluid next oil change.