Traxxas 3954 Spur Gear 38T Mod1 for 3.3 Revo and Slayer 4x4 Pro

Spur gear, 38-tooth (1.0 metric pitch)

Optional Traxxas spur gears allow you to increase or decrease the final drive ratio and tune for different applications. The out-of-the-box spur gear is a 36-tooth.