Speedo Housing GM TH400 34-39 Tooth

The Speedo Housing GM TH400 34-39 Tooth is a precision speedometer gear housing designed for General Motors TH400 automatic transmissions. This component is crucial for those upgrading tire sizes, installing an overdrive unit, or modifying gear ratios on classic and performance vehicles.

This housing drives the speedometer cable from the transmission output shaft, and selecting the correct tooth count within the 34-39 range ensures accurate speed readings across your entire RPM range. The component features precision machining to maintain tight tolerances and consistent engagement with the transmission's output drive gear, which is essential for effective tuning and calibration.

Street rodders, drag racers, and restomod enthusiasts converting to TH400 automatics or recalibrating transmissions after ratio changes will find this housing beneficial. Installation is straightforward and requires no special tools, making it accessible for a wide range of automotive applications.