Key Features
- 20-tooth driven gear with blue color-coding for easy identification
- Direct replacement for GM part number 3987920
- Measures 2.25" x 0.305" x 0.800"
- Fits GM T5 manual transmissions in Camaro and S-10 applications
- Also fits GM Powerglide, Saginaw, and Muncie transmissions
Description
When swapping to a 5-speed or 6-speed transmission, your original speedometer gear won't work with the new final drive ratio, leaving your speedometer reading inaccurately. This 20-tooth driven gear delivers the correct gear ratio correction needed for accurate speedometer calibration in GM T5 transmission applications.
The driven gear installs in your transmission's tailhousing speedometer cable connection point, where it meshes with the output shaft drive gear to generate the proper speedometer signal. The blue color-coding makes tooth count identification instant during installation or parts comparison, eliminating guesswork when selecting the correct gear for your axle ratio and tire size combination.
This gear serves as a direct replacement for GM part number 3987920, ensuring proper fitment across a wide range of GM manual and automatic transmissions. Beyond the T5 five-speed commonly found in Camaros and S-10 trucks, this driven gear also fits Powerglide automatics and Saginaw and Muncie manual transmissions. The 20-tooth count typically pairs with 3.08 rear axle ratios when running stock-size tires, though your specific combination of axle ratio and tire diameter determines the correct driven gear for your application.
Kit Includes
- One speedometer driven gear, 20-tooth, blue