![]() Using overdrive half of the time decreases wear rates by 50 percent compared to using it 75 percent of the time or more often. If overdrive is used, less load pressure is applied on gears and bearings, resulting in less friction and heat produced by torque multiplication. When an engine is under load, RPMs increase to maintain torque multiplication within the transmission. The more frequently a driver uses overdrive, the faster a 4L60e series transmission will wear out. Performance-tuned vehicles also have shorter life expectancies for their transmissions, which require replacement at a faster rate than standard transmissions. High performance vehicles accelerate at much higher rates than regular vehicles, causing significant stress on their transmissions. If a vehicle’s acceleration rate becomes too high, damage can occur to gears and bearings due to excessive heat generated from torque multiplication. The harder a vehicle is driven, the more heat it produces inside the transmission system. There are no other scheduled maintenance requirements for this type of transmission, but there are factors that affect how often a service must be performed: The transmission fluid level in a 4L60e series transmission should be checked when the engine oil is changed, because it will need to be replaced when the oil is drained. A study conducted by GM engineers proved that there was no noticeable difference between Dexron®-III and special additives used in Mercedes Benz and Chrysler transmissions. Dexron®-III is different from Dexron®-II because it can handle higher temperatures without losing viscosity or damaging delicate seals within an automatic transmission system. General Motors uses Dexron®-III automatic transmission fluid in all its vehicles with 4L60e series transmissions, also known as THM400s. ![]() The fluid circulates through a vehicle’s transmission, where it helps separate moving parts of the engine from one another during a process called torque multiplication. ![]() What is transmission fluid? Transmission fluid is a lubricant that reduces the friction and heat produced when the vehicle’s parts move against each other while turning.
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