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2000 Navigator rumble at load

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Old Aug 31, 2017 | 10:33 PM
  #1  
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2000 Navigator rumble at load

We've longed to welcome a Navigator to the family, and recently had the opportunity to do so. We have an Escape and an Explorer.

Our 2000 Lincoln Navigator seems in great shape (minor things here and there). I've noticed while driving it, that on the highway, if I accelerate (already at ~55mph, accelerate anything more than gently), or if the highway becomes an incline, there begins to be a low rumble in the drive train, sounding like a rumble strip.

Based on limited research, I purchased an IWE solenoid (which it seems I'll need to return, as this appears not to have one?). Since that's not likely the issue (based on other information I've read here), I'm not sure what to check next.

Any help would be appreciated!
 
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Old Sep 1, 2017 | 09:45 AM
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Assuming it's nothing to do with the engine, I'd start with the U-joints.
 
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Old Sep 1, 2017 | 10:17 AM
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Originally Posted by alloro
Assuming it's nothing to do with the engine, I'd start with the U-joints.
I don't believe it is the engine, as with the transmission in park or neutral, and taking the engine up to any RPM, it's smooth and quiet.
 
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Old Sep 1, 2017 | 11:23 AM
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No IWEs on the 2000 Navigator.
2nd the motion on the u-joints.
Especially the one on the front driveshaft, back by the transfer case.
 
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