I have a 1999 Wrangler 4cyl. auto. with 133000 miles.I have replaced the front bearings along with the rear bearings. I am still hearing a humming noise comming from my rear diff. When the rear end was apart I did not have any metal in the fluid and the gears appeared to be fine but, I still have a humming sound. Everyone that heard the noise reccomended replacing the bearings so I did.
My question is how much noise should be expected. I understand this is an uninsulated vehicle but jusn need to know what to expect.