Knocking under drivers floor - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 01-27-2011, 05:30 PM Thread Starter
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Knocking under drivers floor

I keep hearing a knocking sound under my feet when turning or going over bumps in the road. I think it's the sway bar bushings but someone told me they replaced theirs and still has the same issue. Is this a common issue and is there a resolution?

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post #2 of 11 Old 01-27-2011, 09:23 PM
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i have basically the same truck, just got it... and it does same thing. feels like it is directly under drivers seat. every time i hit a bump... or turn sharp i can hear and feel it under there.

hope someone has an answer...
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post #3 of 11 Old 01-28-2011, 12:58 AM
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It could be your track bar mounting bolt, it needs to be really torqued down good or it will make a "pop" or "clunk" sound when hitting bumps, going over speedbumps, or turning into driveways, etc.

My truck was doing this shortly after I installed my lift kit and once I retorqued the track bar bolt the clunking was gone!

2005 F-250 CC/SB 4x4 medium wedgewood blue

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5" lift, 5" Donahoe rear springs, 35x13.50 MTZ's, 18x12 Fuel Hostage wheels, 4.30 gears, Banks 4" exhaust, Airraid intake, SCT from Innovative, ARP headstuds, Bulletproof ficm, Scangauge II, Randy Ellis Design lightbar, Street Scene flares, Harpoon mod, Zoodad mod, LED 2010 taillights, Switchback LED front turn signals
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post #4 of 11 Old 01-29-2011, 10:05 AM
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Check your cab bushings...

2006 F-250 FX4

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post #5 of 11 Old 01-29-2011, 10:22 PM
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I have same problem and tightened my track bar more, but no difference. It is an annoying issue.
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post #6 of 11 Old 01-29-2011, 10:34 PM
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I had an 01 f-350 that was doing that and it turned out the spring eye bushings in the front had wallered out and the slack was causing the bump.....this after just a few months with the new lift and bushings... rough country. Anyway i bought a set from energy suspension..that didnt fit ...milled them down to where they would press in and rocked on , problem eliminated. Energy Suspension later told me they didnt make a set for the diesels , but the turned ones were still holding great when i sold it.

Sold 01 350 6" on 37's and mild mods, 00 X 4" on 35's, 02 f350 4" 35's modded from fan to drive shaft, ridin the 03 with nose conversion with 125k and counting upwards slowly.
Never had CNC's poo on any of it, never will.
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post #7 of 11 Old 01-29-2011, 11:08 PM
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It is probably worn out track bar bushings. My 04 made the same noise, sounds like someone hammering on the bottom of the cab right under the pedals. I took out the track bar friday and sure enough the bushings were ovaled out. The new ones will be here monday. Had to get aftermarket polyurethanes because ford and all the other parts places only sell the entire track bar for about 100. New bushings cost 26.
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post #8 of 11 Old 01-30-2011, 06:41 AM
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My 99 and a friends 99 both do the same thing. If anyone has any other success or input please contribute! I'll be checking mine out after brakes.


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post #9 of 11 Old 01-30-2011, 07:03 AM
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i had an 03 and it constantly started knocking under the floorboard under my feet. Turned out it was the ball joints. As far as under the seat, Ive heard the cab bushings could be pinched or worn or something.

Brandon

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post #10 of 11 Old 01-30-2011, 07:25 AM
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Mine is doing it and found the sway bar bushings are bad (not the links). Place your hand over the sway bar bushing so you are touching the bushing and sway bar at the same time and have someone rock the truck side to side. If the bushings are bad, you will be able to feel the sway bar moving inside the bushing. My bushing look fine just looking at them but when I checked them by hand, they are junk.
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