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In order to maintain the proper function of your 2002 GMC Sierra, it is recommended to use Dexron ATF +3 transmission fluid, which has a total capacity of 13 quarts. To ensure the transmission runs smoothly, it is advised to service and flush the automatic transmission fluid and filter every 60,000 miles. This regular maintenance helps prevent gear slippage and other issues that could potentially damage the transmission. Using low-quality transmission fluid can hinder proper lubrication of the gears, leading to metal-on-metal grinding and the accumulation of metal bits and debris in the fluid, resulting in further complications. The cost for transmission fluid typically ranges from $7 to $10 per quart, depending on the brand and consistency of the fluid.
The 2002 GMC Sierra requires ATF+3 transmission fluid for optimal performance.