Subaru
Subaru Impreza
Subaru Outback

What is wrong with a Subaru Impreza Outback 1997 that at certain speeds 30 60 70 MPH an overpowering hum comes from the rear of the car?

Answer

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Wiki User
04/14/2008

First, Change the rear differential oil with 90w-140 gear oil and run it to see if it quiets the noise(it won't make it go away). While you are under there check the axles where they enter the diff, if they are lose disassemble and check bearings. Replace if necessary. Im gonna do that this weekend myself actually.

I did change my rear diff oil and that quieted it significantly.