I had my rear pinion seal changed at the dealer in my 2000 Blazer and now the rear end is making a howling noise which seems to be getting louder as time goes on. I have driven the car only 2800 miles since the seal was changed. It never made any noise before. Any Ideas or direction would be much appreciated.

 

Open up the fill plug and stick your finger in in there. If theres no oil go back to the dealer and make noise of your own.