Need extra cooling for your Baja 5B drivetrain? Look no further than this machined aluminum Pinion Gear Heat Sink that helps cool the pinion gear and clutch for longer spur gear life. This is a replacement part for the heat sink included in the optional Heavy Duty Pinion Gears, and it can be added to the stock pinion gear for extra cooling. Mounting hardware and instructions are included. HPI part # 86712.
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