a one-piece differential carrier housing an input assembly, a power divider, a hollow pinion pear and a wheel differential, said carrier enclosing said hollow pinion gear: and

a through shaft concentric with, but rotating at different speeds from, said hollow pinion gear via said power divider;

wherein said input assembly, said power divider and said pinion gear are rotatingly supported within said one-piece differential carrier by a maximum of three bearings; and

wherein said input assembly, said power divider and said pinion pear are rotatingly supported by an input bearing, an outer pinion bearing and an inner pinion bearing;

a bearing cage attached within said one-piece differential carrier adjacent at least one bearing cage support surface, said bearing cage supporting said inner pinion bearing and a wheel differential bearing;

wherein a threaded inner pinion bearing cup engages complementary threads on said bearing cage to adjust inner and outer pinion bearing preload.