HPI Racing Differential Pinion Gear Set for Micro RS4 Drift

Overview

The HPI Racing Differential Pinion Gear Set is a genuine replacement diff pinion gear and ball joint kit designed for the HPI Micro RS4 and Micro Drift 1/18 scale platforms. The kit includes the diff pinion gear plus the front driveshaft ball joint hardware.

This direct-fit replacement is ideal for refreshing diff internals and front drivetrain parts. Note: To complete the front driveshafts, front differential housing, and output cups assembly, you will also need item #HPI73404 (Servo Arm Set, which includes front driveshafts, diff housing, and output cups).

Key Features

• Genuine HPI Racing Micro RS4 / Micro Drift replacement
• Includes diff pinion gear and front driveshaft ball joints
• Direct factory fit
• Refreshes drivetrain internals
• Durable construction

Performance Benefits

• Restored diff operation
• Refreshed front drivetrain
• Reliable power transfer

Usage Notes

• Pair with #HPI73404 for a complete front driveshaft / diff rebuild
• Use light grease at install

Technical Specs

• Type: Diff Pinion Gear Set + Front Driveshaft Ball Joints
• Manufacturer: HPI Racing

Fitment

• HPI Micro RS4 (1/18 Scale)
• HPI Micro Drift (1/18 Scale)

What's Included

• (1) HPI Racing Diff Pinion Gear Set with Front Driveshaft Ball Joints

Summary

A core diff and front drivetrain replacement — pair with HPI73404 for a complete front-end refresh.