My '01 has a whine from the rear diff under acceleration only, pointing to a worn ring and pinion to my way of thinking. The VX had 150,000 miles on it when I bought it so it is completely understandable! I've changed every fluid to the recommended viscosities with appropriate additives (read, "friction modifiers") all by Amsoil and things got amazingly quiet all the way around. Still a slight whine, but I'm not complaining. I wish she had come with all her service records, but alas, she was bought at dealer auction and had none. Somebody took care of her though...