Buying replacement axles for your diesel has always been a trade off between affordability and quality. OE axles are overpriced and aftermarket axles are terrible quality and fail within a few months.
Diesel drivers drive more miles per year on average and need axles that last. We now import OE quality axles from GKN out of Europe. GKN is an OE supplier to many manufacturers, so quality is tier one and price is much more affordable than OEM.