04 250 Vibrations - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 06-20-2013, 08:28 AM Thread Starter
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04 250 Vibrations

Hey y'all. I'm about at my wits end trying to figure out this vibration in my truck...it is making me not want to drive the damn thing.

When I reach 45 mph the rear end hops so bad it feels like the tires are going to bounce off the ground. It smooths out a little with speed, but never completely goes away. I can watch my tailgate going back and forth in the rear view on the highway. There is also a slight rocking motion in the steering wheel. But I think it's due to the same thing.

That being said, I have had tires balanced, and replaced carrier bearing in drive shaft. U-joints were good when I replaced carrier bearing but truck does have 188k miles.

I don't know what to do with this thing....any comments or opinions are welcome, I have a trip coming up and I need this thing to ride better! I'm happy to provide any more details I can.


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post #2 of 8 Old 06-20-2013, 08:49 AM Thread Starter
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Also, does anyone know of a place that will balance drive shafts near Auburn, AL? Im thinking im gonna pull the drive shaft, drive it with the front wheels, and see if it goes away. That should tell me whether its the tires or drive train. But I wanna have a place set up if I need to get some work done.

2004 F-250 6.0L FX4

-ARP Headstuds
- AirDog II
- Swamps 48v FICM + Atlas 40
- 4" turbo back w/ single 6" Mitre Cut stack
- AFE Stage II Intake
- EGR Delete
- blue spring, and other updated goodies.
- Coolant Filter
-CAT ELC EC-1 Coolant


Tunes From:Vivian @ Quick Tricks, Inc.
-Looney Wild
-Looney
-Agressive Tow
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post #3 of 8 Old 06-20-2013, 01:46 PM
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your positive the u joints are good? what about the slip yoke. put it in neutral once it starts to roll put the e brake on and leave it in Neutral then check the joints


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post #4 of 8 Old 06-25-2013, 07:59 PM
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You can still have a dead/heavy spot in the tire. when the tire hits that spot, it doesnt compress at the same rate as the rest of the tire and causes a tramp Sometimes having your tires balances and O.E. matched will correct this, or you may have a bad tire.

O.E. matching lines the high spot in the tire with the low spot in the wheel to cancel each other out. then there is a number called road force variation that will tell you "this spot of the tire takes X amount of pounds extra to compress" the closest to zero is the best. for a car we like to see less than 10 and trucks are a crap shoot. the worst i ever saw was 142 or something like that on a huge tire.
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post #5 of 8 Old 06-26-2013, 05:44 AM
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Quote:
Originally Posted by mustangmike6996 View Post
You can still have a dead/heavy spot in the tire. when the tire hits that spot, it doesnt compress at the same rate as the rest of the tire and causes a tramp Sometimes having your tires balances and O.E. matched will correct this, or you may have a bad tire.

O.E. matching lines the high spot in the tire with the low spot in the wheel to cancel each other out. then there is a number called road force variation that will tell you "this spot of the tire takes X amount of pounds extra to compress" the closest to zero is the best. for a car we like to see less than 10 and trucks are a crap shoot. the worst i ever saw was 142 or something like that on a huge tire.
that truck probably shoulda had a good number of dyna beads.


07 F250 Lariat ECSB bed FX4 6.0
leveling kit, DDM HID's
XD Strike 17x9 -24 offset 295/70/17 Hankook ATm
fox shocks & fox dual steering stabilizer kit
4in. straight pipe, Riff Raff boots, Beans sump
ARP's, Tuned, Deleted
coolant filter, bluespring, CAI
6.4 Banjo Bolts, BPD FICM
Alpine Head unit, 4 Hertz 140W door speakers, 2 rockford fosgate 10's, kenwood amps.

More pics in profile.
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post #6 of 8 Old 06-29-2013, 03:23 AM
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Quote:
Originally Posted by MyTractorsSexy View Post
that truck probably shoulda had a good number of dyna beads.


Ive only ever seen beads used a couple times.

Normally if we got a tire with Road Force Variations like that, we would O.E. match it as low as possible, test drive it and recommend a new tire if it still had high harmonics.
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post #7 of 8 Old 06-29-2013, 03:53 AM
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What kind of tire balancer did they use. The older ones are not even remotely close to the new ones. I went through a similar situation and had them rebalanced on a newer dynamic machine and all four showed anywhere from 66-128lbs of road force on stock tires. Gave me a good excuse to get my 35's.

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post #8 of 8 Old 06-29-2013, 03:54 AM
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Originally Posted by hucorey View Post
What kind of tire balancer did they use. The older ones are not even remotely close to the new ones. I went through a similar situation and had them rebalanced on a newer dynamic machine and all four showed anywhere from 66-128lbs of road force on stock tires. My wife didn't really enjoy the bouncing around but I kinda did. :p Gave me a good excuse to get my 35's.

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EDGE,S&B,SCT,PHP Hydra,TS-Perf,OEM parts,Sam Wyse trans,VB's,LED's,MBRP,ISSPRO,ICON,FOX,KC TURBOs,SD 7.3 fuel kits, HPOP lines

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