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Ed (not verified)    December 8, 2024 - 1:42PM

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I have a GMC Canyon (purchased new) that developed a horrible shudder as it accumulated some miles. Brought it back to dealer, and they changed the fluid under warranty. Truck shifted better, but not great. After warranty expired I asked if they would install AMSOIL ATF, which meets/exceeds GM specs…nope, they wouldn’t do it. Changed it myself and discovered that they had underfilled the transmission by a good quart and a half. Did the drain and refill 2x and the truck now shifts perfectly.

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