- Gears in a manual transmission engage within a shift fork, according to the Weekly Reader Complete Car Care Manual. Automatic transmissions use a torque converter and a series of planetary gears to regulate power to the drive wheels. The mating of the gears creates wear particles in the transmission fluid as it lubricates these parts. Changing the the transmission fluid removes most of those wear particles.
- Transmission fluid acts as a lubricant for the moving parts of the transmission, according to 10w40.com. Well-lubricated transmissions run at cooler temperatures and operate at their maximum efficiency, extending the lifespan of the transmission.
- Changing the transmission fluid usually includes changing the transmission fluid filter. Proper filtration will keep wear particles from circulating through the lubrication passages of the transmission. If the transmission employs a paper filter, it will need to be changed along with the transmission fluid. If the transmission uses a mesh screen filter, it can be cleaned and reused.
- The gasket between the transmission body and the transmission oil pan can become loose, allowing transmission fluid to leak. Replacing the transmission fluid allows the technician the opportunity to examine the gasket seal. Cork seals have to be replaced. Rubber seals do not need replacement.
- The recommended time between changing a car's transmission fluid has gradually gotten longer. Sales literature for the Oldsmobile Alero states that transmission fluid lasts up to 100,000 miles. The Pontiac Grand Am literature says the transmission fluid does not need changing. Samaris.com recommends taking the car to the dealer of the car's manufacturer for transmission service. Technicians there can advise you on the needs of your particular model.
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