Speedo Driven Gear GM 23-Tooth Black

The Speedo Driven Gear GM 23-Tooth Black is a precision speedometer drive component engineered for General Motors Powerglide, 200C, 375B, and 475 automatic transmissions. This driven gear sits at the heart of your vehicle's speedometer system, translating transmission output shaft rotation into accurate speed readings on your instrument cluster. Whether you're restoring a classic muscle car, rebuilding a vintage truck, or replacing a worn speedometer component, this 23-tooth plastic gear delivers the correct gear ratio for true-to-life speedometer calibration.

Constructed from durable black plastic, this driven gear meshes with the speedometer drive gear mounted on the transmission output shaft to create the mechanical link between vehicle speed and dashboard indication. The 23-tooth design is specifically calibrated for GM automatic transmissions and ensures that speedometer needle movement corresponds accurately to actual vehicle velocity. Plastic construction is intentional—it provides the ideal wear characteristics and noise reduction compared to metal alternatives, while the tooth profile is precision-molded to maintain consistent mesh and prevent binding or slippage during normal operation.

Technicians and enthusiasts working on Powerglide, 200C, 375B, and 475-equipped vehicles benefit most from this replacement component when speedometer accuracy has drifted or the original gear has suffered tooth wear or breakage. Installation requires access to the speedometer cable housing at the transmission—a straightforward task for those familiar with transmission-mounted components. This single gear replacement is sold individually, making it ideal for point-repair jobs where only the driven gear requires replacement rather than entire speedometer cable assemblies.