Kyosho LA403 - Center Diff. Gear Set (ZX7.5) - center differential gear set for LAZER ZX7.5  [KY-LA403]

Center differential gear for ZX7.5

The Kyosho LA403 Center Diff. Gear Set is an RC-scale replacement part designed for use with the LAZER ZX7.5 platform. This article focuses on what the part does in a typical drivetrain, how it fits into maintenance and tuning workflows, and practical installation reminders for hobby mechanics.

Functionally the center differential gear set transfers torque between front and rear outputs in the model's drivetrain, affecting traction balance and handling characteristics. When servicing the LAZER ZX7.5, replacing the center diff gear set is a standard step if you notice excessive play, irregular noise, or if you are restoring original drivetrain performance after heavy use.

Installation guidance here is deliberately general to avoid assumptions about specific tools or chassis variants: confirm correct orientation of the gear stack, verify smooth gear mesh with the pinion and spur engagement, and check surrounding bearings and spacers for wear before final assembly. Use measured gear mesh and avoid overtightening screws that preload the differential bearings.

Tuning role: swapping center diff gears or changing differential build (e.g., shims, oil, or clutch settings where applicable) alters front/rear torque distribution and transient response. Treat the LA403 as a direct replacement component that enables controlled tuning through differential assembly adjustments rather than a performance upgrade by itself.

Compatible Models

• LAZER ZX7.5