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The powertrain of a heavy-duty truck consists of the engine, transmission, driveshaft, and differential. Common transmission options include manual and automatic systems, with many modern trucks opting for automated manual transmissions (AMTs) that improve fuel efficiency and ease of driving. Heavy-duty trucks often come with 10 to 18-speed transmissions, providing the flexibility needed for varying terrains and load conditions.


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Regular maintenance of transmission gear oil is vital to ensure optimal transmission function. Over time, the oil can become contaminated with dirt, metal particles, and other contaminants, which can lead to decreased performance and potential damage to the transmission. Drivers should adhere to the manufacturer's recommended service intervals for changing transmission fluid, typically ranging from 30,000 to 100,000 miles, depending on usage and vehicle type.


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