One solution for a transmission that is slipping is to put new gear bearings on or to install a new transmission altogether. Sometimes, a new transmission is the only way to get the vehicle functioning properly again. If the whining noise is due to the worn transmission, this noise will not go away until the transmission is fixed. However, if the whining noise is caused by low fluid levels, the noise will cease after the fluid is refilled.
It is dangerous to continue driving a vehicle with a slipping transmission and a whining noise. When you notice these symptoms, immediately take the car to a mechanic or your car’s dealership service center so that you may remain safe.