Engine "thud" with load - Ford Powerstroke Diesel Forum
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Old 09-30-2013, 01:49 PM
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Engine "thud" with load

I have a engine sound kinda like a thud but hard to explain. Still seems to have good power though. Could low transfer case fluid, low front or rear diff fluid be the cause? Not sure that its coming fro the engine either just a noise. Thanks
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Old 09-30-2013, 03:05 PM
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Automatic or manual transmission? When exactly does this happen, on launch, while underway, turning/straight, etc? What do you mean by "load"? Just driving it empty down the road, or are you towing/hauling?
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Old 09-30-2013, 03:07 PM
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It is automatic. Usually happens while underway. First noticed it while towing 4000 lbs but now notice it when driving empty
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Old 10-02-2013, 09:14 PM
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Convertor lose?
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Old 10-02-2013, 10:30 PM
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If you get the thud when placing it in either drive or reverse, it's likely that your splines need to be lubed. Define "underway" just so we're clear.
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Old 10-02-2013, 10:33 PM
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It is more of a repeating thud at higher speeds. What are some things that i could do to see if my converter is loose? The engine also seems to sputter or almost misfire when letting off of the gas after cruising down the road. could this be part of it?
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Old 10-02-2013, 10:36 PM
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That might be a little over my head but I would at least pull the inspection cover off just to take a look. You might have to play with the symptoms a little more to narrow it down to either the engine or trans. Is it just at higher speeds or higher RPMs?
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Old 10-02-2013, 10:53 PM
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higher speeds usually. for the sputtering thing. the engine thud was most apparent while towing and once i hit around 2100 rpm but once it made the noise it would keep doing it even if i let off of the gas until i slowed down to a certain point then would be just fine. and during this it didnt lose any power and shifted fine. I did get around 12 mpg which seemed low for only towing 4,500lbs.
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Old 10-02-2013, 10:57 PM
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I wouldn't be as worried with your MPG. I only see about that unloaded

I'd say it's something in the drive line with what you're saying. It's over my head at this point but I'd check the U-joints for play and look at the carrier bearing.

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Old 10-02-2013, 11:04 PM
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Thats exactly what i thought too. So I took the driveline into driveline services of portland and had them replace all three u-joints and carrier bearing and balance it. Havent heard as bad of the noise after that. Now it is mostly the idle thing that is weird. And squeeky accesory belt but thats not a bike problem
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