Serpent 903811 Race-Grade 2-Speed Shaft for Viper 990 GP  [SER903811]

Precision 2-Speed Upgrade for Viper 990 GP

The Serpent 903811 Lightweight 2-Speed Shaft is made for the Viper 990 GP chassis and crafted to refine gear transitions. Built from robust materials, this shaft trims weight and helps deliver crisper acceleration and better drivetrain efficiency for competitive track days.

Why a Lighter Shaft Helps on the Track

Reducing rotating mass with a lightweight 2-speed shaft lowers inertia, which gives quicker throttle response and cleaner upshifts. For racers seeking consistent lap times, this is a practical drivetrain improvement.

Fitment Notes and Simple Installation

This part fits the Viper 990 GP layout for a direct replacement and integrates with the stock gearbox arrangement. Installation is straightforward for experienced hobbyists and requires standard tools to get you back on the circuit quickly.