HPI Baja Precision Rear Dog Bone SBJ118R by GPM  [SBJ118R]

Engineered steel rear dog bone for Baja driveline upgrades

The SBJ118R is a CNC-friendly specification steel rear dog bone designed as an aftermarket replacement for HPI Baja rear drivetrains. Machined material selection targets increased torsional stiffness and wear resistance to support higher load transfer and reduce deformation under repeated stress.

Installation follows standard driveline service procedures: remove the rear wheel assembly and differential output retainers, extract the existing dog bone, and insert the SBJ118R ensuring precise engagement with axle cups and differential output. During assembly, verify hex fastener torque and bearing seating to maintain concentric rotation and avoid premature wear patterns.

From a setup and performance viewpoint, the SBJ118R increases drivetrain rigidity which modifies torque delivery characteristics through the rear axle. For optimized results, evaluate drivetrain backlash, final drive ratio and suspension damping in concert to maintain predictable traction and component life.

As a precision aftermarket rear driveline link for HPI Baja models, the SBJ118R provides measurable increases in stiffness and wear resistance and should be fitted with attention to adjacent hardware and bearing condition.