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Single knock under load *WEIRD!!

Discussion in 'Under the Hood' started by Creager, December 17, 2004.

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    1. Creager

      Creager Well-Known Member

      Joined:
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      City, State:
      Charlotte, NC
      Year, Model & Trim Level:
      '92 Sport 4x4
      Everytime my truck gets that initial load a knocking sound is heard. It almost sounds like a (metal) slapping noise. I dont know man, its been occuring for over a year, it hasnt got any louder, it hasnt changed in tone or anything and its always garenteed to happen, i could set my watch by it.

      I checked all the drive line. Wheel joints to the transmission, everything is tight and snug. I thought it might be the exhaust; i got under there an bent the exhaust shield back at all the choak points and i still got no change (THAT WAS NOT EASY!).

      So im in the same place i was a year ago, what the hell is making that noise?
       
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    3. IZwack

      IZwack Moderator Emeritus

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      City, State:
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      Year, Model & Trim Level:
      1998 Ford Explorer
      I've read a few threads that matches what you've said - though it can still be many many things. Anyways, what I'm thinking is that you're rear drive shaft has gone dry. I forgot what it's called but its the joint that allows you to advance your driveshaft forwad (relative to the car's chasis) a little bit when you want to disconnect it from the rear differential. There are a few threads on this forum on how to grease this joint up. Try this first - its relatively cheap to do and shouldn't take too long.
       

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