Vibration
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Vibration
It had been a couple of weeks since I drove my '99, F350 and when I pulled it out this week, it had a bad vibration somewhere in the drive train. I had fought this some time ago and replaced rear drive shaft u-joints and thought that got it. After I drove for 10 or 12 miles the vibration seemed to lessen and go away (for the most part) I did not replace the carrier bearing when I did the other u-joints as it seemed in good condition. It seems like something 'tightened' up while it was sitting and after driving it loosened up.
Any thoughts would be appreciated.
Thanks in advance!!!
Any thoughts would be appreciated.
Thanks in advance!!!
Posting Guru
Joined: Nov 2004
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From: North Dakota
BWOP, I'm fighting the same thing! I posted it in the super duty section about a week or so ago. My vibration seems only noticable as you come to a stop and at slower speeds (less than 20mph). over the last week and doing some checking I've narrowed mine down to one of three things (I hope). Mines deffinitly in the rear drivetrain. on a hoist you can put your hand on the rear dif and feel a fast vibration at less then 15mph, this leads me to believe it's either a U-joint, the Carrier Bearing, or the pinion bearing! I cann't not find any play what so ever in any of the u-joints but I can move the driveshaft around a bit at the point of the carrier bearing. It doesn't seem t be the bearing but more the rubber around the bearing seems a little loose. After checking my bosses 05' his does the same thing at the carrier so I'm leaning towards the pinion bearing. As soon as 8:00 rolls around I'll be making a call to a reputable shop and see what they think and when they can get it in. I'll let you know what the diagnosis is as soon as I find out (probably be a few days yet).
Posting Guru
Joined: Nov 2004
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From: North Dakota
Well, I just got off the phone and my diagnosis is 99.99% correct (pre-tear down). My description sounds as if it's the pinion bearing. Which if it has any deterioration (obviously it does) it has more than likely contaminated the rest of the rear end and all of the bearings should be changed, basically a R&R on the rear end (ouch $500)!! Time for a set of 4.30s, but that'll be another topic, lol.
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SLE - Thanks for the reply!! I'll be anxious to here if that takes care of your problem. I haven't narrowed it down to the rear drivetrain or front end. I will also let you know.
Excursionsicily - I don't think ANY vibration is normal. Need more info on whether it's engine or drivetrain!!!
Excursionsicily - I don't think ANY vibration is normal. Need more info on whether it's engine or drivetrain!!!
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From: spring tx
My '02 CC 4x4 had the same problem. Checking the u-joints on a lift everything seemed fine. Once I pulled the driveshaft I found the rear joint to be very stiff. Replaced all and no problems since.
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Originally Posted by KINGKEITH
My '02 CC 4x4 had the same problem. Checking the u-joints on a lift everything seemed fine. Once I pulled the driveshaft I found the rear joint to be very stiff. Replaced all and no problems since.
As I took it off, I realized the rear u-joint was locked up. No slack, just nice and squeeky and stiff.
And just before I did that, I noticed a little bit of vibration... it was gone afterwards.
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Well...... I heard enough of you talk about the need to grease the splines on the driveshaft to eliminate the 'clunk' and I thought.... I wonder if I could get a vibration from that. I did not grease the splines when I had the shaft out to change u-joints and noticed it was a little 'sticky' putting it back to gether. So, I dropped the shaft and greased it up. Put it all back together and have driven it a couple of times and have noticed NO vibration. Seems that this may have been the problem. Go figure.
thanks for your input.....
thanks for your input.....
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You said that you let the truck sit for a few weeks before driving it again. When you drove it, did you go on a decently long trip? Roughly around twenty miles? If you just went a short distance, and didn't get up to freeway speeds, then your tires develpoed a flat spot from sitting for an extended period of time. If that is the case, I would get the truck out to the freeway and get her up to speed for at least twenty miles. See if that doesn't eliminate some of that vibration before yo go tearing into the truck. That is the Ford specified procedure for their techs when diagnosing a vibration concern.
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Good thought..... You'd think these expensive radials would not have that problem. I will keep that in mind in the future. Last week drove it almost 1000 miles and everything was good. For some reason got almost 14 - 15 mpg gallon also. I'll take it!!!
Thanks
Thanks
