Traxxas 18-T Machined 1.0 Metric Pitch 5mm Shaft RC Pinion Gear - 6491X 3 inch this is the direct OEM

this is the direct OEM replacement sourced from Tamiya

Designed for use during kit assembly

TRX5391R gives you everything needed to rebuild the gearbox casing rather than replacing the entire drivetrain assembly

Rear-specific fitment — not interchangeable with front drift tyres

and having a dedicated rebuild kit on hand means you can restore drivetrain performance without replacing the entire shaft assembly

Traxxas 18-T Machined 1.0 Metric Pitch 5mm Shaft RC Pinion Gear - 6491X 3 inch this is the direct OEMThe Traxxas TRX6491X is a machined 18 tooth pinion gear designed for Traxxas RC drivetrain applications requiring a 1. 0 metric pitch gear and a 5mm motor shaft. Precision machined rather than stamped, this pinion gear offers tighter tolerances than a standard replacement, making it a solid choice when rebuilding or servicing the drivetrain on compatible Traxxas models. It ships with a set screw for secure shaft fitment. Key Features 18 tooth (18T)