I think they are taking you for a ride. The differentials should be check every year, but only to add oil. Yes some can die early, but there are differentials out on the road that are 40,50 years old and still running fine. I suggest you find another garage to go to, and next time some one says metal shaving, tell them to let you see and go to the vehicle and have them get some out for you. And if there were shavings, which I have seen, there would also be noise coming from the deferential, a low hum to clanking. To let you know shavings are metal slivers and not the normal wear that looks like gray mud.
Randy
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