TRAXXAS Gear, 12-T pinion (32-p), heavy duty (machined, hardened steel)/ set screw # 3942X
Accessory part for these models:
E-Maxx
E-Revo
Slash 4X4 Ultimate
Slash 4X4
Stampede 4X4 VXL
Stampede 4x4
TRX-4 Assembly Kit
TRX-4 Ford Bronco
TRX-4 Scale and Trail Crawler
TRX-4 Tactical Unit