HPI Racing is a Heavy Duty Drive Gear for the transmission of the Baja 5B. This 20 tooth gear is precision machined from high carbon steel. With a smoother finish to the teeth and more precise roundness, this gear has less friction for quieter running, increased efficiency and longer life than the stock gear. This is a direct replacement part for the 86486 stock gear on the Baja 5B. Instructions are included. Recommended for heavy duty applications in conjunction with the following parts: 86481 Heavy Duty Diff Gear 48 Tooth, 86485 Heavy Duty Idle Gear 30 Tooth.Comes with pins/clips, as shown in image.