Hello everyone in the forum. How are all of you doing? thank you for taking your time to help.

The question would be on my 1999 Lexus GS300 . On acceleration there is this whistling noise coming from the rear of the vehicle. Its get louder when you go faster. but will fade away once reach about 40 mph at a constance speed. Can anyone help please. Thank you.

 

Some guy on here had the same problem. Started happening to him when he changed the diff fluid. I'd pobably drain and refill the fluid with some synthetic blend.