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This is a 13-tooth CNC-machined metal input gear for Arrma's BLX 3S trucks, including the Big Rock, Kraton and Outcast. It replaces the stock input gear in the drivetrain, where the pinion drives the diff ring gear. Machined steel holds up better than the sintered stock part under brushless power and hard landings, which is why bashers swap it in when teeth strip. It is a single small part, so it only makes sense for someone already repairing or upgrading an Arrma 3S drivetrain.
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In stockShips from Canada · duties may applyReturn policy
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Owners of Arrma 3S trucks who have fitted this gear report it outlasting the stock input gear under brushless power. Most treat it as a routine durability upgrade rather than a performance part.
Arrma AR310886 CNC Metal Input Gear 13T BLX 3S BigRock Kraton Outcast
