violent vibrations around 40-45 mph - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 05-16-2010, 12:03 AM Thread Starter
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violent vibrations around 40-45 mph

i've had this problem for a while. when i first got the truck used i didn't notice it too much cuz i didn't really hover around that speed. but now i have to drive at 40 mph a lot and everytime i do the truck starts to vibrate pretty violently. it starts at 40 mph and stops at 45...and if i blow past that speed i dont really feel it. it's really weird. i thought it might be my balance so i had the tires balanced and rotated but nothing. anyone have any idea what this might be...? i'm just worried it might be the start of something bigger and worse to come. any help would be awesom. thanks all.

2004 F250 6.0L PSD FX4

Mods:
Airaid Cold Air Intake
SCT X3 Innovative Diesel Tuner
MBRP 4" Turbo Back Exhaust System
12" Rockford Fosgate Sub
6" Pioneer Touchscreen Headunit
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Zoodad
CS Monitor w/ EGT Probe
Sinister Coolant Filter

Future Mods:
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post #2 of 16 Old 05-16-2010, 12:11 AM
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is this truck a crew cab? ex cab?


check your carrage bearing under the bed where the cab ends. check for play in the shaft.

2006 Ford F250 CCSB FX4 6.0




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1997 F350 CCLB 2WD 7.3
1999 F350 CCLB 4WD 7.3
2003 F350 CCLB FX4 6.0
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post #3 of 16 Old 05-16-2010, 01:15 PM Thread Starter
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yea it's an extended cab...sorry.

2004 F250 6.0L PSD FX4

Mods:
Airaid Cold Air Intake
SCT X3 Innovative Diesel Tuner
MBRP 4" Turbo Back Exhaust System
12" Rockford Fosgate Sub
6" Pioneer Touchscreen Headunit
10% Window Tint
Zoodad
CS Monitor w/ EGT Probe
Sinister Coolant Filter

Future Mods:
2.5" Leveling Kit
Oil Bypass Kit
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post #4 of 16 Old 05-25-2010, 01:05 PM
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I had the same exact problem, only between those speeds and it wasn't balance or alignment, it was a worn rag link and TRE. Once it was replaced everything was back to normal.

I was convinced it was ball joints and bearings going or track bar which was almost new going again.

2005 F250 Crew Cab Lariat
8" Fabtech 4 Link
40" Pro Comp's on 20's
Magnaflow exhaust
SCT Livewire
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post #5 of 16 Old 06-06-2010, 05:09 PM
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i have the same problem , i don't feel the vibration in the steering wheel , but the whole truck is vibrating,do you think drag link,tie rods would cause this
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post #6 of 16 Old 06-09-2010, 06:50 AM
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If the whole truck is shaking I'd think it was a tire and wheel balance issue.

2005 F250 Crew Cab Lariat
8" Fabtech 4 Link
40" Pro Comp's on 20's
Magnaflow exhaust
SCT Livewire
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post #7 of 16 Old 06-09-2010, 07:13 AM
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tires & wheels been checked & balanced 4 times ,even had tires replaced still have vibration 45-50 mph
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post #8 of 16 Old 06-09-2010, 05:36 PM
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U joints on these trucks don't come with grease fittings...at least 02' didn't...Chances are your needle bearings in your U joints are warn out....Drop your drive shaft and take your U joint apart...An old truck of mine had this issue...dropped the shaft and took the U joint apart and dust came out where the needle bearings were supposed to be...On the front of my pop's 31' Model A it must have 30 grease fittings...If we pay as much as we do for these Super duty s I think there should be grease fittings on the U joints...

sorry for the lengthy post

Hope this helps
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post #9 of 16 Old 06-10-2010, 09:22 AM
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i checked all u=joints,carrier bearing ,wheel bearings didn't find anything loose
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post #10 of 16 Old 06-10-2010, 09:33 AM
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Mine was doing the same thing and it was U-joints.

2006 F250 CC Short Box Lariat
4" ProComp lift
18" Ice Metal Chrome Rims with 35" Kumho KL78's
Banks Monster Turbo Back Exhaust
Edge Attitude with A2 moniter and back up camera
AFE Stage II intake
Pace Edwards roll up bed cover
10" Sub in Center Console
Line-X Bedliner

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