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The recommended rear differential fluid type for the 2006 GMC Sierra 1500 is Rear Axle SAE 75W-90 Synthetic Axle Lubricant. When changing the fluid, ensure you have a large container ready as the old oil will drain out when the plate on the rear axle is removed. After draining the oil, reattach the plate securely. Look for the intake port on the top of the axle and refill it with oil until it reaches the full line. Remember to clean up any oil spills on the axle or plate to prevent a burning smell.
In a 2006 GMC Sierra 1500, 80-weight oil is utilized as the rear differential fluid.