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This is an optional metal gear conversion set from HPI. These metal gears replace the stock plastic gears inside the servo for increased durability, perfect for the rugged conditions typically found when driving the Savage monster truck. Broken servo gear teeth are a thing of the past with these parts. The set also comes with a new servo top case and a ball bearing that replaces the stock plastic bushing, delivering more precise servo movement, longer servo life, longer battery life, and increased durability. We highly recommend this set as a high performance upgrade, especially when a high power 5 cell receiver battery pack.
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