Drivetrain Vibration - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 01-16-2010, 08:47 AM Thread Starter Rookie
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Drivetrain Vibration

I live near Houston and have a stock '08 F-450 with 80,000 miles. It started to have a vibration between 7,500 and 10,000 miles ago. (Hard to pinpoint as it was gradual) At 65 mph a vibration starts and progressively gets worse the faster you go. Does not matter whether it is loaded or not. Now it will rattle the teeth out of your head. Have had new tires installed and rotated 3 times. 2 Dealers have checked from front to back with the "Well it is a 450 and that is the way they are" statement. BS I drove this truck off the lot with 3 miles on it, have records of all service, etc., and I know how the truck is supposed to drive. Need help from an actual mechanic and not some dim witted technician who can only diagnose a problem with a computer.
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post #2 of 3 Old 01-20-2011, 11:15 PM Rookie
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I have a similar issue as the one you have described.

I have a 08 450 CC with 23K miles. I noticed a vibration at 64-66 mph. I took it to a local tire shop today where I do business, they balanced the tires and took it for a test drive. The vibration was still there at the same speed. They jacked the truck up with all the tires off the ground and checked my driveshaft with the truck running in low gear. Im not a mechanic so I will probably not get the technical names right but here is what they found:

1. The drive shaft did not have any play in it.

2. The driveshaft at the rear of my truck where it connects to the rear differential was not spinning in a perfect circle. ( I was there looking at it while they were doing this)

3. When they loosend the bolts that connect the driveshaft to the yoke (just before the rear differential) they found that the bolt holes are large enough to allow the drive shaft not to be perfectly centered with the yoke.
In other words, the drive shaft and the yoke could be put together without the two being perfectly centered (because the bolt holes are large enough to allow for a small amount of movement in different directions). My guess from what I saw is there is about 1/16 of inch movement in different directions once the bolts are loose.

4. They attempted through trail and error to use a peice of chalk while the truck was in gear on jackstands to center the two pieces.

5. They said they got it as close as they could using that method.

I took the truck out for a ride to test it after they did this and it certaintly made a difference but it did not solve it completly. I now have considerably LESS VIBRATION and it does not occur at 64-66 MPH. Only a small amount of vibration now occurs somewhere around 57 MPH.

I am now convinced I have identified my vibration problem, but Im not sure how to fix it.

How can you get the Drive shaft and the yoke PERFECTLY centered when mounting them together?

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post #3 of 3 Old 02-19-2011, 08:08 PM Rookie
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I had a similar issue. I was pulling my fifthwheel and noticed a vibration that only happened when I applied throttle. I got to my destination and the next morning I checked my tires, lugnuts, suspension...everything looked fine until I happened to notice the yoke on the rear differential end of the driveline. I DESTROYED a bearing. Took it to Ford and it was fixed in 2 hours. All good now.
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