The procedure is pretty simple, just drain out as much of the transmission as you can (some fluid will be left inside the torque converter). Measure what you drained out and refill. Then drive it around to get the fluid circulated. Drain and refill, drive it around.
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The common automatic transmission fluid change interval for the GMC Sierra is every 30,000-60,000 miles depending on condition of the fluid. For “severe” use such as towing often, hauling heavy weight, or sitting in stop and go traffic, it’s better to change the fluid every 30-45,000 miles.
In other words, automatic transmissions work harder than manual transmissions because they do all the shifting for the driver. While most manufacturers recommend an ATF change every 60,000 to 100,000 miles, you might want to check your transmission fluid every 30,000 miles just to be sure.
4 days ago · In general, automatic transmission vehicles should have the fluid drained at a frequency ranging from every 60,000 to 100,000 miles. With harder-worked manual transmissions, the transmission fluid
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how often to change automatic transmission fluid