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

Aftermarket steel rear dog bone for Baja platforms

The SBJ118R is a steel rear dog bone produced as an aftermarket replacement for RC HPI Baja chassis rear drivelines. Its steel construction favours increased stiffness and wear resistance over softer original links, intended for model maintenance and setup rather than any full-size application.

Installation is simple for those used to basic driveline servicing: remove the rear wheel assembly and diff output retainers, withdraw the old dog bone and install the SBJ118R, ensuring correct engagement with axle cups and the differential output. While assembling, inspect hex screws and adjacent bearings to ensure free rotation and reduce the chance of early wear.

From a setup viewpoint, replacing standard dog bones with steel changes drivetrain stiffness and the way power is delivered through the rear axle under load. That can affect traction behaviour and component longevity; when making handling changes, consider drivetrain lash and suspension together rather than focusing solely on the dog bone.

For HPI Baja RC buggies, the SBJ118R steel dog bone is a practical, more robust replacement for routine repairs and drivetrain upgrades; check fitment and related hardware during installation.