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SportTrac Discussion
Engine & Drivetrain
2007 Limited 4.6 (Surging or Pulsing?)
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<blockquote data-quote="Lloyd Chaudoin" data-source="post: 1007892" data-attributes="member: 70555"><p>How many miles on vehicle? How many miles since transmission service? It sounds like the clutch in the torque converter is unlocking and locking. It is probably in sixth gear by then and feels like it is have a hard time with torque output and rpm level. My truck usually doesn't go into sixth til at least 45 mph or so. It sounds like the fluid/friction modifier is gone in it. The fluid could still be red/dark red and the friction modifier be gone. The shuddering is most likely from that. I would suggest a fluid and filter change. Make sure you use Mercon SP or LV. If you service it, Oreilley auto parts sells Motorcraft stuff and can get it pretty fast and cheaper than Ford sells it at.</p></blockquote><p></p>
[QUOTE="Lloyd Chaudoin, post: 1007892, member: 70555"] How many miles on vehicle? How many miles since transmission service? It sounds like the clutch in the torque converter is unlocking and locking. It is probably in sixth gear by then and feels like it is have a hard time with torque output and rpm level. My truck usually doesn't go into sixth til at least 45 mph or so. It sounds like the fluid/friction modifier is gone in it. The fluid could still be red/dark red and the friction modifier be gone. The shuddering is most likely from that. I would suggest a fluid and filter change. Make sure you use Mercon SP or LV. If you service it, Oreilley auto parts sells Motorcraft stuff and can get it pretty fast and cheaper than Ford sells it at. [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
2007 Limited 4.6 (Surging or Pulsing?)
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