GPM TRAXXAS TRX4 Steel Adjustable Main Shaft TRX4037SAN - Chassis Option  [TRX4037SAN]

Adjustable main shaft for TRX4 crawlers

This TRX4037SAN kit is an aftermarket replacement designed for the TRAXXAS TRX4 Trail Crawler, providing a hardened steel adjustable main shaft fitted into an alloy outer body with the supplied o-rings and screws. The universal swing-shaft cross head expands steering and crawl angles on scale lines while the pinned head lowers the chance of components loosening during axle articulation.

Measured shaft lengths include separate adjustable ranges for front and rear mounting so you can tune wheelbase and axle position for clearance or chassis balance. The included white silicone o-rings act as cushions to reduce metal-to-metal contact and extend service life under high articulation angles.

Use this set to adjust axle placement and steering geometry for better clearance and crawl performance while keeping a focus on durable mechanical fitment.