HPI Savage/Savage X/Savage K4.6 Engine Alloy Differential Lock by GPM SAV1025  [SAV1025]

Alloy differential lock for Savage series

This alloy differential lock is an RC-scale drivetrain part designed for HPI Savage platforms, including Savage, Savage X and Savage K4.6. It replaces or upgrades the stock differential internals to provide a firmer engagement pattern intended for tuning traction and load transfer in off-road setups.

Fitment is focused on the Savage family of models; installation follows standard diff replacement practice where the unit is fitted into the existing diff housing and secured using the original mounting points. Check for proper mesh and clearance with the spur and pinion before final assembly, and verify smooth operation through the suspension travel range.

In tuning terms this differential lock serves to reduce unwanted differential slip under acceleration and braking, helping to make throttle response and weight transfer more predictable on loose or high-traction surfaces. It can be used as part of a wider drivetrain setup adjustment alongside gear selection and shock tuning.

Routine inspection of engagement surfaces and bearings is recommended after heavy runs. Clean any debris from the diff and re-lubricate with appropriate differential grease to maintain consistent behavior and longevity.