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

Heavy duty rear dog bone for Baja use

The SBJ118R is an aftermarket steel rear dog bone built for RC HPI Baja models, serving as a direct rear driveline replacement. Its steel makeup aims to give a firmer, more wear-resistant alternative to softer factory parts and is intended for model repair and tuning tasks rather than any full-size application.

Installation is suited to hobbyists who have done basic driveline work: remove the rear wheel cluster and diff output fastenings, slide out the old dog bone, and fit the SBJ118R, checking that it engages correctly with the axle cups and differential output. Inspect and clean hex fasteners and local bearings while assembling to maintain smooth rotation and limit premature wear.

On the track or trail, swapping to a steel dog bone alters drivetrain stiffness and the way power transmits through the rear axle when loaded. That can change traction response and durability; when refining handling, consider drivetrain lash and suspension settings together rather than isolating the dog bone as the only variable.

For routine maintenance or a tougher driveline setup on HPI Baja buggies, the SBJ118R steel dog bone is a sensible upgrade; double check fit and related hardware when fitting.