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
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Type: Diff Pinion Gear Set + Front Driveshaft Ball Joints
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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.
