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whining noise from rear end
I purchased a used 2010 rav4 base model 4 cylinder engine. It is AWD.
I had the wheels aligned and balanced and oil changed. But I noticed there is a whirring/whining sound coming from the rear end. When you start driving from a stop it is low pitched and as you increase in speed the pitch gets higher.
The guy at Meineke told me the sound appears to be coming from the rear differential. He said these are known for this sound and Toyota has a TSB out on this topic. He suggested that if I ignored the sound that it would eventually lock up.
I am not really interested in "throwing parts" at it until the noise finally goes away. What would you do to confirm the source of the noise?