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  1. G

    Knock when accelerating, especially up hills.

    If it was the transmission, wouldn't it just be while it was shifting then, instead of constant? :shrug:
  2. G

    Knock when accelerating, especially up hills.

    Yes, it's an automatic. No, it's not one loud knock. It sounds like a lot of semi-quiet little knocks, rather rapid, probably about 7-10 little knocks a second while accelerating.
  3. G

    Knock when accelerating, especially up hills.

    63,500 miles, with oil changes every 3,000 miles using Pennzoil 5W-30. It's more of a higher pitched, extremely rapid knocking sound, and it doesn't happen at all while in park/neutral.
  4. G

    Knock when accelerating, especially up hills.

    My 1997 Mustang has a noticeable, but not overly loud knock when accelerating, especially when going up hills. It is not quite so loud when on a flat road. I just changed the spark plugs, thinking that it would be due to spark knock, but I didn't change the wires. After having the plug...
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