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The 2006 GMC Sierra trucks require ATF+4 power steering fluid, which should be topped up at the power steering reservoir and pump situated in the engine compartment. These trucks are equipped with a hydraulic power steering system that pushes fluid through lines to the steering rack to help with turning. If you find that steering your truck has become harder than usual, it could indicate low fluid levels in the system. It's essential to inspect the lines and pump for any leaks that may have occurred over time and replace any faulty parts to ensure your steering operates smoothly.
Dexron, Mercon, Type F, and ATF+4 are varieties of power steering fluids that are utilized in the 2006 GMC Sierra pickup truck.