From a professional perspective, there are several reasons why an original factory gearbox is better than a self purchased gearbox:

质量保证：原厂变速箱由汽车制造商生产或委托制造商生产，其质量经过严格的控制和测试。它们符合原厂标准，并且经过长时间的实际使用验证，具有可靠性和耐久性。

Quality assurance: The original gearbox is produced by an automobile manufacturer or commissioned by a professional manufacturer, and its quality is strictly controlled and tested. They meet the original factory standards and have been validated through long-term practical use, demonstrating reliability and durability.

适配性：原厂变速箱是为特定汽车型号设计和制造的，与车辆的其他部件紧密配合。这确保了变速箱的兼容性和性能匹配，使得整个车辆系统能够正常工作并达到性能。

Adaptability: The original gearbox is designed and manufactured for a specific car model, closely fitting with other components of the vehicle. This ensures compatibility and performance matching of the transmission, enabling the entire vehicle system to operate normally and achieve optimal performance.

技术支持：购买原厂变速箱意味着您可以获得汽车制造商提供的技术支持。在安装、维修和保养过程中，您可以咨询制造商的技术人员，获取正确的指导和建议。这有助于确保变速箱的正确安装和操作，以及及时任何问题。

Technical Support: Purchasing an original gearbox means that you can receive professional technical support from the car manufacturer. During the installation, repair, and maintenance process, you can consult the manufacturer's technical personnel for correct guidance and advice. This helps ensure the correct installation and operation of the transmission, as well as timely resolution of any issues.

保修和售后服务：原厂变速箱通常提供更长的保修期限，并且享有制造商提供的售后服务。如果出现任何质量问题或故障，您可以获得制造商的支持和维修服务，这为您提供了更多的保障和便利。

Warranty and after-sales service: Original transmissions usually offer longer warranty periods and enjoy the after-sales service provided by the manufacturer. If there are any quality issues or malfunctions, you can obtain the support and repair services of the manufacturer, which provides you with more protection and convenience.

保值性：原厂变速箱具有更高的保值性。在二手车市场上，购买原厂变速箱的车辆通常会受到更高的评价和认可，因为它们符合正规渠道和质量标准，而且具有更好的可靠性和可信度。

Value preservation: The original gearbox has higher value preservation. In the second-hand car market, vehicles that purchase original transmissions usually receive higher evaluation and recognition because they meet legitimate channels and quality standards, and have better reliability and credibility.

总结起来，原厂变速箱比自己购买的变速箱更好，主要是因为其经过质量保证、适配性好、享有技术支持、提供保修和售后服务，并且具有更高的保值性。这些优势可以确保变速箱的质量和性能，为您提供更好的驾驶体验和长期可靠性。

In summary, the original factory gearbox is better than the gearbox purchased by oneself, mainly because it has undergone quality assurance, good adaptability, enjoys technical support, provides warranty and after-sales service, and has higher value preservation. These advantages can ensure the quality and performance of the gearbox, providing you with a better driving experience and long-term reliability.
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