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

Steel rear dog bone for Baja

The GPM SBJ118R is an aftermarket steel rear dog bone intended for RC-scale HPI Baja platforms, designed as a direct replacement part for the rear driveline connection. Its specification as a steel component targets applications where a stiffer, wear-resistant link is preferred over softer stock parts, and it is offered for model-level maintenance and tuning rather than any full-size use.

Installation is straightforward for hobbyists familiar with basic driveline work: remove the rear wheel assembly and diff output retention hardware, slide out the old dog bone, and fit the SBJ118R in place, confirming proper engagement with the axle cups and differential output. Check mating hex screws and the condition of nearby ball bearings during reassembly to ensure smooth rotation and minimise premature wear.

In tune-up terms, replacing rear dog bones with a steel unit changes drivetrain stiffness and can alter how power is transmitted through the rear axle under load. This affects traction feel and durability; when adjusting handling, consider drivetrain backlash and suspension setup together rather than attributing behavior to the dog bone alone.

As a replacement rear driveline link for HPI Baja RC buggies, the GPM SBJ118R steel dog bone is a practical option for routine repairs and for builders seeking a more robust driveline component; verify fitment and supporting hardware during installation.