Knocking under floorboard after heavy load - Ford Powerstroke Diesel Forum
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  #1  
Old 05-19-2014, 06:18 PM
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Knocking under floorboard after heavy load

I did a really heavy load (whole pallet of pond pebbles from Home Depot) the other day with my truck and now there's a knocking noise. It is coming from under the floorboard and I can feel it in my left foot. It almost feels as if something is hitting right under my foot. It's seems worse at slower speeds but I don't notice it much once at highway speeds. Rough roads make it worse. I've looked under the truck at the leaf springs and shocks and nothing appears to be loose. I definitely don't want anything to break on me. Any ideas what it could be or what I should check?
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Old 05-19-2014, 06:34 PM
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Check your spring eye bushing's.
I put a leaving kit on & eye bushings only lasted a little over a year.
Highly recommend poly type bushings.
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Old 05-20-2014, 07:16 PM
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Quote:
Originally Posted by letitsno View Post
Check your spring eye bushing's...
What exactly am I looking for when I check these?
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Old 05-20-2014, 07:26 PM
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Mine does the same thing under really heavy load, but only when starting off. I thought mine was broke transmission mount or motor mount, but havent been able to find it yet. Only does it when I pull my 30ft. travel trailer. Feels like a knocking under the floor board with a hammer from underneath. Mine stops if i let off and start off a little easier, but doesn't do it after around 10-15mph.

Sorry to be so long, but let us know if you find out before I do, and i'll do the same.

Best of luck!
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Old 05-21-2014, 04:55 AM
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Body mounts do that. May or may not be your issue. The two front ones get worn. Then thers a bit of looseness and it pops when it flexes. The rear one under cab on back also gets pulled in. Almost cone shaped going in. It was flat when new. I had to make it lat agin and grind it smoother. Easiest fix is replace body mounts with poly bushings. Sway bar links too but thats not what hitting you in the left foot.
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Old 05-22-2014, 10:56 AM
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Quote:
Originally Posted by Chadm105 View Post
...Feels like a knocking under the floor board with a hammer from underneath...
This is exactly what mine feels like as well.
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Old 05-22-2014, 11:13 AM
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Quote:
Originally Posted by melmount View Post
Body mounts do that. May or may not be your issue. The two front ones get worn. Then thers a bit of looseness and it pops when it flexes. The rear one under cab on back also gets pulled in. Almost cone shaped going in. It was flat when new. I had to make it lat agin and grind it smoother. Easiest fix is replace body mounts with poly bushings. Sway bar links too but thats not what hitting you in the left foot.
I took a look at the body mounts and this is what I found. I know it's not the greatest pic but it is the left front body mount. It definitely seems that this is what could be causing the knocking. Unfortunately I have no idea how I would go about fixing it.
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Knocking under floorboard after heavy load-photo376.jpg  
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