Make sure your RC rock crawler, trail truck or rock racer has the correct pinion gear for peak performance. AMain stocks all sizes and types for repair and replacement, in all popular pitch types including 64 pitch, 48 pitch, 32 pitch, and module mod .6, mod .1, and mod .5 metric sizes for 1/8 and 5mm shafts. Plus caddies, adapters, cases and set screws. AMain has the OEM and optional aftermarket gears your 4X4 needs.