I’m singeing out Honda differentials here because I have a great deal of experience with them. The AWD (All Wheel Drive) model Hondas such as the CRV and Element often use a special fluid in their rear differentials. This fluid is called “double pump II”. Later, they switched to Honda ATF. On vehicles like the MDX, Ridgeline, and late model RL’s and TL’s, they use Honda VTM4 fluid. Be sure you know what fluid goes into your Honda differential and that you replace it with the correct fluid. The reason I bring this up is because I have seen Honda differentials cause noise from time to time. Often the first thing I do in this situation is change the differential fluid. The fluid should get changed about every 30,000 miles. If not, it tends to break down. When it does break down what is commonly heard is a nose on turns coming from the rear of the vehicle. This noise can often be cured with a fluid change. As stated you need to make sure you use the correct fluid. These fluids are specially designed to work with Honda differentials. Using the wrong fluid could result in damage to the differential. So if you have a noise coming from the rear of your AWD Honda, change the differential fluid with the correct Honda fluid and see if the noise goes away. In this video I show how to change the differential fluid in my 2004 Element.