Shop Nissan Altima Transmission Components. Purchase Nissan Altima Auto Transmission Components & Nissan Altima Gearbox Parts Catalog. Maintaining the transmission components of your Nissan Altima is crucial for ensuring a smooth ride and longevity of your vehicle. To extend the life of your transmission, regularly check fluid levels, change the fluid according to manufacturer guidelines, and be mindful of signs such as slipping gears or unusual noises that could indicate the need for replacement parts. When choosing new transmission components, consider OEM parts for their guaranteed compatibility and reliability, or opt for aftermarket alternatives that offer unique features or cost savings. High-quality materials in components like torque converters and gear sets ensure durability, while following precise installation instructions can prevent costly errors. Keep your Nissan Altima in top gear with the right maintenance and quality parts from our comprehensive online selection.