I do like paying the local shop for oil changes. They do it cheap and do good work plus they tell me things like this when I don't have time to be crawling under my truck checking the diff oils. Worth the money to save the time and mess!
I'm a little irked because the fluids are part of the 150k mile service schedule. I bought my truck with 147k on it. You think the dealership would have checked the fluid and replaced it before the sale but no... This truck is turning out to be a lemon and I don't think I will be buying another truck from them!