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Posted on May 14, 2011
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I have a 1997 Ford F-150 Lariat, and when pulling a trailer it makes a chattering noise when the gas pedal is pressed down to pick up speed. When going up a hill it will not go passed 40 mph and starts to shift hard when pressing the gas pedal. In normal driving without a load and getting on a highway and picking up speed the first two shifts are hard and then smoothes out. The truck has around 130K of miles on it, mainly highway miles. What could the problem be?

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  • Posted on May 14, 2011
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If tranny is manual shift you may have a bearing and or bad gear. Try changing tranny fluid. Check manual for correct fluid may use tranny fluid rather than gear oil. I recommend using Royal Purple fluid or gear oil. This very expensive but will slicken up the shifting and extend bearing and gear life.

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