U-Joints and vibration
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Joined: Jul 2003
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From: North Carolina usa
U-Joints and vibration
1993 F-150 Pickup straight drive - had the u-joints replaced and now there is a nasty vibration when you reach speeds above 30mph. What can be the culprit? Did not have this vibration prior to replacement of the u-joints they where just squeaking.
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Joined: Dec 2002
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From: Billings MT
U-Joints and vibration
Did you mark the orientation of the driveshaft before taking it out? My guess is the driveshaft is out of balance now.
Ok, let's go back a step. You had it done at a shop, correct? If so, take it back. Tell them about it and make them drive it.
Now, I bet they got something out of balance or dropped a few roller bearings.
Ok, let's go back a step. You had it done at a shop, correct? If so, take it back. Tell them about it and make them drive it.
Now, I bet they got something out of balance or dropped a few roller bearings.
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Joined: Dec 2002
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From: Billings MT
U-Joints and vibration
Did the shop remove/install the driveshaft? I assume they did, and they should have taken it for a spin.
Is it a constant, whether you are on the throttle or just coasting?
I have a feeling that they got the slip yoke turned 180* or the other end. This is just a guess, but something must have been turned for it to start vibrating.
Good luck with it.
Is it a constant, whether you are on the throttle or just coasting?
I have a feeling that they got the slip yoke turned 180* or the other end. This is just a guess, but something must have been turned for it to start vibrating.
Good luck with it.
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From: North Carolina usa
U-Joints and vibration
How many possibilities is there in putting the drive shaf back on.
I know it can only be rotated 180 degrees, but can the fornt or back yoke be rotated 180 and give more possibilities?
I know it can only be rotated 180 degrees, but can the fornt or back yoke be rotated 180 and give more possibilities?
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Posting Guru
Joined: Dec 2002
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From: Billings MT
U-Joints and vibration
front yoke can and depending on the back, it can also. 9", Sterling 10.25", 8.8" rearends are different and I am not that familiar with them all.
Take it back, have them balance it. Throw a fit, take a manager on a spin, an out of balance driveshaft vibrates like nothing else.
Take it back, have them balance it. Throw a fit, take a manager on a spin, an out of balance driveshaft vibrates like nothing else.
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Joined: Jul 2003
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From: North Carolina usa
U-Joints and vibration
It is a two-piece drive shaft - I have a long bed pick-up
I took the truck back today and they still are searching for what is causing the vibration. I had them rotate the drive shaft - did not change the vibration. Another question I have is - is it possible that the drive shaft front and back could have been reversed and would that be cause?
I took the truck back today and they still are searching for what is causing the vibration. I had them rotate the drive shaft - did not change the vibration. Another question I have is - is it possible that the drive shaft front and back could have been reversed and would that be cause?
Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
U-Joints and vibration
No, one is shorter than the other. But with a two piece driveshaft there are many combinations for putting it back together. I hope they marked it before they took it apart. It is def. a driveshaft vibration so they better not be looking anywhere else. If they can't get it back the way it was (because they didn't mark it) then make them re-balance the driveshaft since they didn't put it back together right. Sometimes, if you put the shaft back together right, it will have vibration because of the U-joints not being what originally was in there when it was balanced. Worst comes to worse you make them re-balance the shaft.
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From: North Carolina usa
U-Joints and vibration
!993 Ford F-150 straight six manual transmission long bed.
How do you determine the center support bearing is bad or not?
I have an associated problem - read my post on ujoints and vibration.
How do you determine the center support bearing is bad or not?
I have an associated problem - read my post on ujoints and vibration.
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New User
Joined: Jul 2003
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From: North Carolina usa
U-Joints and vibration
!993 Ford F-150 straight six manual transmission long bed.
How do you determine the center support bearing is bad or not?
I have an associated problem - read my post on ujoints and vibration.
How do you determine the center support bearing is bad or not?
I have an associated problem - read my post on ujoints and vibration.
Posting Guru
Joined: Dec 2002
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From: Billings MT
U-Joints and vibration
The rubber in the carrier bearing(another name for it) is separated from the metal bearing or there is play greater than 1/4" or so when you push on the shaft around it. You'll know. I had mine replaced by a shop for $65 including labor, but I took the shaft to them. If the rubber looks old and dry, replace it.
Logistics Pro
Joined: May 2003
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From: Northern Illinois
U-Joints and vibration
can you wiggle your driveshaft in the bearing around?? does the rubber support look like it is bad?? is there a bunch of "dry" looking grease thrown from the bearing?? are the seals on the bearing ripped or torn?? many way's to tell if it is bad
not a safe way but you could support the back of the truck with jack stands, whhel chocks on the front tires start it up and put it in gear and watch the driveshaft spin, may show you a little more on the bearing being good or bad
not a safe way but you could support the back of the truck with jack stands, whhel chocks on the front tires start it up and put it in gear and watch the driveshaft spin, may show you a little more on the bearing being good or bad