Speedo Driven Gear GM 35 Tooth Orange

The Speedo Driven Gear GM 35 Tooth Orange by TCI is a critical transmission component engineered for General Motors vehicles equipped with mechanical speedometer systems. This driven gear meshes with the speedometer drive gear to translate transmission output shaft rotation into accurate dashboard speed readings. Mechanics and transmission builders rely on this component when rebuilding or retrofitting GM automatic transmissions, particularly when replacing worn original equipment or upgrading to aftermarket transmission assemblies that require precision speed signal accuracy.

The 35-tooth design is precision-molded in durable nylon composite with the distinctive orange color that distinguishes it from earlier gear ratios—a visual identifier that prevents installation errors during transmission assembly. This tooth count directly affects speedometer calibration; pairing the correct driven gear with your transmission's specific drive gear ensures accurate mile-per-hour display and proper odometer function. The compact 2.85 x 2.1 x 4.1 inch profile fits standard GM speedometer cable housings, and the lightweight 0.13 lb construction minimizes rotational inertia while maintaining gear mesh integrity under continuous operation.

This replacement gear is essential for any GM transmission rebuild, particularly in TH350, TH400, and related powerglide variants where speedometer accuracy directly impacts vehicle functionality and resale value. Installation is straightforward—the driven gear simply presses onto the speedometer cable housing inside the transmission tailhousing. Verify your original driven gear tooth count before ordering; using an incorrect ratio will result in speedometer error, affecting fuel economy calculations and cruise control operation on modern GM vehicles with electronic speed compensation.