54R300 and 58R397 axles accommodate the trend toward larger load-haul-dump (LHD) and underground-mining trucks. The 58R397 fits 20- to 25-ton LHDs and 55- to 60-ton mining trucks. A specially designed planetary drive for a larger and higher-capacity axle shaft provides longevity, and the carrier assembly has a robust differential to handle high horsepower. The 54R300 handles the duty cycles of 50- to 55-ton mining trucks. A high-capacity differential and carrier assembly provide durability and longevity.