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Excursion - King of SUVs 2000 - 2005 Ford Excursion

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  #1  
Old 07-04-2009, 09:11 PM
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Update on driveline vibrations

I have posted sevaral times about my 03 Ex and it's driveline vibes- mainly highway speed and when slightly on the gas...
Took it to a local 4 wheel drive shop that specializes in lifts. They jacked it up and I ran the X up to highway speed with the rear in the air. It was amazing how rough it is, even at 55mph. I hardly feel it in the vehicle at that speed while driving. Anyway, they felt the vibration but had no idea where it is coming from. They said pinion angle looked fine and since I have a retubed driveshaft and rebuilt rear, they ruled that out. The owner has an 04 with a 6 or 8" lift and 37's and seems to know about Excursions.
I then took it to the local Ford dealer and had the service manager drive it. He strongly feels it is gear mesh with the ring and pinion. I am not totally convinced as the rear is quiet, gear wise. What do you think?
For that matter, my slip yoke has quite a bit of torsional slop, likely as much as the backlash on the ring and pinion but the driveshaft shop said that it is acceptable.
I am supposed to take this big vibrator on vacation in three weeks and am getting desperate.....
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Old 07-04-2009, 09:55 PM
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I rebuilt many rear ends and they have to be awfully bad to vibrate the truck. Are you sure it is not a spark miss? They can mimic a vibration at higher, low rpm, load bearing speeds.
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Old 07-05-2009, 08:49 AM
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Definitely driveline.
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Old 07-05-2009, 08:56 AM
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They used a short and a long pinion yoke. The short one sometimes wobbled after it wore the splines.
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Old 07-05-2009, 08:46 PM
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Today, I rotated the driveshaft (again) on the pinion flange and it got somewhat better. That rules out the ring and pinion theory for me. I am wondering if the splined part of the driveshaft and slip yoke are vibrating when in between loads.
EXv10- Please explain more about the long and short pinion yoke.
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Old 07-05-2009, 09:08 PM
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There is a post somewhere about the problem Ford had with the short pinion yoke (on the diff) so they went to a longer splined one. They were wearing out and vibrating.

HERE; http://www.ford-trucks.com/forums/78...ml#post6633046
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Old 07-06-2009, 01:58 PM
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What about your U joints? I just replaced mine and it drives so much better. The annoying vibration is now gone. Turns out I still had the orginals on mine with 129K+ on the clock.
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Old 07-06-2009, 05:14 PM
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My experience with a vibrating driveline would cause me to check the Universal joints first for looseness and roughness. If the u-joints do have grease fittings I would grease them to see if that helps. Another culprit that causes vibration is the center bearing. If the shaft is loose in the bearing it will vibrate.
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Old 07-07-2009, 05:23 AM
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I crawled under the X again last night and found a little slop in the ujoint at the transfer case end. They are 4 months old. Anyway, I have another driveshaft out of a SC F250 and it is exactly one inch longer, but the slip yokes are the same. So I switched yokes- ujoint flange and all- just to try it. The vibrations start at 45mph now and are there regardless of load- constant. So, my next step is to throw a shim under the tapered block and add some pinion angle. I will try and do that tonight. Vacation is getting closer.- PaulT- thanks for the advice. The Excursions have one piece drivelines and no center bearing.
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Old 07-07-2009, 02:41 PM
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I know at around 180k I developed a vibration. Had the drive shaft balanced and all was fine. When the truck was newer at around 45k it had an issue with the torque convertor and it cause a bad vibration no shop could find except for one.
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Old 07-08-2009, 05:26 AM
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Going today to talk with the driveline shop about getting a CV joint added. I am at the breaking point. I attempted to put pinion shims in it last night. Found that the little nubbin on the block was not long enough for my tastes with the shim added. The night before, I tried a completely different slip yoke assembly and it vibrated worse. So last night, I put my original slip yoke assy back on. The ujoint on the transfer case side was a little sloppy (4 months old). I pumped it with grease and now the vibes are constant and heavy at all speeds above 40 mph. I suppose because the grease tightened up the ujoint. The CV joint will be next. If that does not fix it, I guess i will change the transfer case. It has a little play at the yoke even after changing the entire rear housing with another one. Those of you with non vibrating Excursions have it lucky. I cant even enjoy driving mine for the vibes.
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Old 07-08-2009, 08:54 AM
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I wouldn't waste tons of money on a CV joint! A few shims won't do anything either. You are just repacing things that are just as bad or missing the problem. That would be like getting a new door because you can't find the rattle. Everything is fixable unless it totally demolished. Did you replace the bushing in the tail housing? Inspect the pinion yoke for loosness? Is your driveshaft bent? Maybe the other one you tried is just as bad. Don't put an expensive band aid on it, someone in here will guide you to a fix! The other trucks that are lifted that much aren't vibrating!!
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Old 07-08-2009, 09:27 AM
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Have you tried removing the rear driveshaft and running it in 4WD?
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Old 07-08-2009, 10:30 AM
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Did you by any chance take your "truck nuts" off, the vibration damper that is mounted under the transaxle? If you did, that will cause a vibration. If you never had them your truck has been neutered, they can be put back on though.

Click the image to open in full size.

Even the position of a hose clamp on a boot can cause vibration according to the manual. If you have them on the boot move them around by trial and error.
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Old 07-08-2009, 11:26 AM
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Things i have done to track this down---
*Replaced entire output housing on transfer case including tailshaft bearing and yoke from a 30,000 mile F250
* Rebuilt rearend with new pinion and carrier bearings- old ones were fine
* Had driveshaft retubed and balanced by a reputable shop
*New ujoints
*Indexed driveshaft on every position on both pinion and transfer case yokes
*The two vibration dampeners are both present and accounted for
*Checked transfer case mount and motor mounts
The vibrations have been present from the time I bought it in November at which time it had totally stock suspension. It had a rear ujoint that was bad so I replaced both. The only thing at all that makes a difference is rotating the driveshaft around. It makes a very slight difference though. I have personally seen three different driveshaft variations in Excursions. That tells me Ford knew about issues. Mine also has 4.30 gears so I am sure driveshaft speeds are playing an issue as well.
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Old 07-08-2009, 11:26 AM
 
 
 
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