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I have a 2001 F-150 with what I believe to be the 4R70W transmission. It's a 4 speed automatic with the 4.6L engine.

The past two times I have driven it I have gotten a massive shaking and stuttering from the drivetrain. Each time it happens after accelerating when trying to maintain speed going uphill. Just beforehand the engine RPMs drop down, which I presume is the torque converter lockup attempting to engage.

Even though the truck is stuttering, the engine maintains speed just fine.

If I accelerate, the stuttering stops immediately.

Could something be preventing the torque converter from locking up? Or is there another possible cause of this? The transmission has 285,000 miles on it.

  • Fluid level correct? When was the last time the automatic trans filter and fluid has been changed. – CharlieRB Nov 11 '16 at 18:04
  • Fluid is on the dipstick hashed area. Changed fluid and filter at 260000 miles. Was able to change 12 quarts of fluid, I guess a couple are in the cooler. – Eric Urban Nov 11 '16 at 18:05
  • Did it act this way before having the fluid/filter change? – CharlieRB Nov 11 '16 at 18:14
  • does this happen only on hills? – Ben Nov 11 '16 at 18:52
  • @CharlieRB that was years ago, no it did not happen then. – Eric Urban Nov 11 '16 at 18:59

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