Positioned inside the nose of the differential casing, this heavy-duty tapered roller bearing takes the brunt of the immense axial thrust and high-RPM radial loads transferred from the propshaft directly through the pinion gear.
When upgrading to a new limited-slip differential (LSD), swapping your crown wheel and pinion ratio, or chasing down rear-end whine, replacing the inner pinion bearing is standard workshop best practice. It provides the crucial rigidity required to maintain flawless alignment between your pinion teeth and the crown wheel, protecting your expensive drivetrain components from premature wear under demanding track, stage, or fast-road conditions.
