Speedo Gear Driven 34 Tooth GM Auto Trans

The TCI Speedo Gear Driven 34 Tooth GM Auto Trans is a replacement speedometer drive gear specifically designed for General Motors automatic transmissions. This part is ideal for classic car builders, restoration shops, and transmission rebuilders who are working with GM 200C, 375B, TH425, TH475, or 700R4 transmissions.

This plastic-bodied driven gear features a 34-tooth configuration that is crucial for accurate speedometer calibration. It meshes with the transmission's drive gear to translate driveshaft rotation into speedometer needle movement. TCI's engineering ensures proper tooth profile and diameter tolerances that maintain the correct gear ratio necessary for precise speed readouts.

Before purchasing, it is essential to verify your specific vehicle and transmission compatibility, as the 34-tooth design is standard for certain combinations. Using the incorrect tooth count can lead to inaccurate speed readings, either reading high or low. This replacement part is vital for those servicing or rebuilding the specified GM transmission platforms.