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This is one of the most important upgrades of your Savage truck. The HD 18-23 teeth gear replaces the original 18-23T gear in the Savage transmission and offers huge improvement of the transmission durability. You can also add small amount of grease or other lubricant that can help the gears to avoid metal-to-metal contact, but keep in mind that thinner liquid lubricants won't stay without modifications of the gearbox (sealing). Do not use silicone lubricants, they don't lower the friction!