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Old Mar 23, 2009 | 11:29 AM
  #1  
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wishboat
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clunk

When in overdrive if i hit the gas semi hard it dowshifts and i get a clunk noise. If i run with overdrive off i get no noise. any ideas ? THANKS
 
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Old Mar 24, 2009 | 06:00 AM
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Welcome to FTE. Would you please let us know what year and mileage you have? Some problems are specific to certain years.
 
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Old Mar 24, 2009 | 10:59 AM
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It ia 2004 f-150 with 45000 miles on it.
 
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Old Mar 24, 2009 | 12:11 PM
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is it in 2wd or 4wd when you notice it?
 
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Old Mar 24, 2009 | 06:27 PM
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In 2wd. only when it down shifts from overdrive.
 
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Old Mar 24, 2009 | 09:08 PM
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first thing i would do is go under and have a look at all your u-joints and check your diff pinion to see if you can tell if there is an excess amount of backlash between the pinion and ring gear
 
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Old Mar 24, 2009 | 10:31 PM
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Originally Posted by Drizzt
first thing i would do is go under and have a look at all your u-joints and check your diff pinion to see if you can tell if there is an excess amount of backlash between the pinion and ring gear
Come on, he only has 45K on his truck. There shouldn't be any pinion / ring gear back lash. We are driving Fords here not chevys. LOL.
 
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Old Mar 25, 2009 | 12:49 AM
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it only takes 2 minutes from some moron setting up the diff...

just throwing my opinion out there.
 
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Old Mar 25, 2009 | 06:14 PM
  #9  
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From: nevada
mine too

I have heard this clunk on my 05 4WD. It has only happened a couple of times, when it seems to think about what gear it should be in and then shifts to something else when I'm playing with the gas pedal in traffic. Other than that, everything has been great.
 
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Old Mar 26, 2009 | 12:05 AM
  #10  
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I had a similar clunk on a SuperDuty (two piece drive shaft) at about 45,000 miles. Greasing the splines fixed it.
 
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Old May 5, 2009 | 09:02 PM
  #11  
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I had a similar clunk with my 2005. I thought it was the trans, but it turn out to be a bad coil that was causing the engine to misfire and make that sound. Jim
 
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