Transmission life can be one of the most concerning issues for new car buyers because they are costly to replace and difficult to predict. Transmission lifespans are determined on a case-by- case basis and are influenced by a variety of factors. Time and mileage vary depending on how drivers use their transmissions. Some transmissions have a lifespan of just over 10,000 miles, while others have a lifespan of over 200,000 miles or approximately 7 years. However, regular vehicle maintenance is the most important factor influencing a transmission’s lifespan, and good maintenance can help it last even longer.