Vibration starting at 15mph
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Vibration starting at 15mph
I have a 2008 F350 Supercab V10 DRW Automatic with vibration from the rear of the truck starting at 15 mph up. It's worse at 25 mph. The dealer has replaced the rear tires and one wheel and even replaced the ring and pinion gears. The FSE balanced all the tires and the vibration has not changed.
He used a diagonstic tool which did not pick up the vibration and said that everything was within Ford specs. Yet he can feel the vibration and said that it is normal for the truck.
I feel that a vibration that starts at low speed and can be felt up to 50-60 mph is a driveshaft issue.
Does anyone have any idea or has anyone experenced this.
He used a diagonstic tool which did not pick up the vibration and said that everything was within Ford specs. Yet he can feel the vibration and said that it is normal for the truck.
I feel that a vibration that starts at low speed and can be felt up to 50-60 mph is a driveshaft issue.
Does anyone have any idea or has anyone experenced this.
Fleet Mechanic
Joined: Apr 2007
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From: NH
Well, being an 08 i wouldn't think the u-joints are bad but that of course may depend on how it has been used. Has this been doing it since new? Are you the original owner? How much and how hard do you tow? (i'm assuming you tow being a DRW). Is the truck stock (lift mods?). Sorry for all the questions but the more insight and the better we can try and help. Mileage? 4x4? Did the mechanic check the driveshaft u-joints, wheel bearings, axle shafts etc.?... How bad is the vibration?
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I bought the truck new and tow a four horse gooseneck and a two horse bumper pull. The four horse fully loaded is about 11000# and the two horse about 4400# loaded. There are about 19400 miles on the truck and there are no modifications and it is 2 wheel drive. I don't think that thet have taken a good look at the u joints, but they said that they reindexed the shaft.
The vibration started at 2000 mile on the truck and has not changed with all that they have done.
The vibration started at 2000 mile on the truck and has not changed with all that they have done.
Fleet Mechanic
Joined: Apr 2007
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From: NH
I was going to mention re-indexing the shaft. How is the vibration when towing? the same? or worse? Unfortunately it maybe a process of elimination. If you take a load off the rear (jack up the rear with tires/wheels off) and put in neutral, try shaking the shaft with both hands. It should have no play and solid as a rock. You could also start and put in drive at low speed and see if you feel it without the wheels on the ground as well as a visual. Make sure it is fully and properly secure and the front wheels chocked.
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I have jacked up the truck and have taken one wheel off at a time with no change in the vibration. The vibration remains the same towing or not and changes very little when I load the bed with 1500# of feed.
The only movement in the driveshaft is in the center bearing , but it is the rubber part. Not much though. I was thinking it might be a u joint that is binding. I tried to get another dealer to look at it but after he spoke with the FSE he would not even take the truck for a drive.
The only movement in the driveshaft is in the center bearing , but it is the rubber part. Not much though. I was thinking it might be a u joint that is binding. I tried to get another dealer to look at it but after he spoke with the FSE he would not even take the truck for a drive.
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To update my vibration problem, I have an answer.
I took my truck to a driveline shop and they confirmed that the spline and slip yoke had too much backlash and the balance weights on the front shaft were placed 180 degrees
apart, which counteract each other. Great job of quality control on Ford's part.
Now I have to get Ford to reopen the file on the truck and have the FSE pull his head out of his rear end an admit that he does not know how to diagnose a drive shaft vibration and replace the drive shaft. Ford customer NO SERVICE.
I took my truck to a driveline shop and they confirmed that the spline and slip yoke had too much backlash and the balance weights on the front shaft were placed 180 degrees
apart, which counteract each other. Great job of quality control on Ford's part.
Now I have to get Ford to reopen the file on the truck and have the FSE pull his head out of his rear end an admit that he does not know how to diagnose a drive shaft vibration and replace the drive shaft. Ford customer NO SERVICE.
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