A month or so ago I could hear a very slight noise (whine) from the differential. Sine the gears were replaced just under a year ago I took it back into the shop and they confirmed the noise. (Chipped pinion gear). Now, three gear sets later the noise right from get go is worse. The shop says the pattern is good and everything appears OK. They accept that there might have been one bad gear set but not three so they are looking for another cause. They seem to recall an article dealing with an internal alignment issue and want to research this before popping in another gear set. (This is costing them nothing but money now).
My question, have any of you ever experienced such an event and if so what was the cure.