Using these K - series billet selector forks is straightforward. First, make sure your vehicle's engine is off and cooled down. Replace the old selector forks in your gearbox with these new ones. When shifting gears, you'll notice a smoother and more reliable operation. As for maintenance, regularly check the selector forks for any signs of wear and tear. You can do this during your routine vehicle servicing. Also, keep the gearbox clean and lubricated as per your vehicle's manual. Avoid over - stressing the gearbox by shifting roughly or under high - load conditions that aren't normal for your vehicle. This will help these selector forks last longer and keep your vehicle running smoothly.