Ford - F150 :: 2005 - Rear End Vibration


Apr 17, 2016

So I have a very annoying vibration in a 2005 Ford F150 FX4 5.4L w/ approx 122k miles. This 'rear-end' vibration became noticeable about a year ago when I put a new set of tires on. And just for the record, this vibration was never a problem beforehand. So it should be obvious that I have bad tires right? Thus, I instantly go back to tire dealer and explain the situation. They took it apart and checked balancing on all tires and confirmed that they were fine. So after dealing w/ it for a few weeks and rotating the tires around a few times and experimenting with pressures nothing worked. This time we noticed the U-joints were now loose on the driveshaft, which we then replaced. But this didn't fix the issue. I then took it to a separate Ford dealer to have the tires 'road force' tested, which nothing found.

I then had Ford dealer try to diagnose the issue with several trips back and forth with their apparent 'best' people on it. I went on numerous test drives explaining the issue. The vibration only seems to be noticeable on road and with speed. Not in the shop in the air. It seems to be pinpoint approx. 50-55mph. and minimal at lower speeds. Also seems to get worse with turns and bumps in the road. You can literally watch the bed of the truck vibrate in the mirrors. (also seems to be more on drivers side) It doesn't affect the steering or anything in front of vehicle.So Ford also had me come back another time to use a special vibration analyzer on it, which still found nothing. They checked ball joints, suspension, you name it. The only fix they could recommend was a new driveshaft, which I regretfully accepted the challenge and now it's sitting in my garage. It didn't work. I ended up taking my original shaft to a balancing shop and they found no issues with it. Also looked at front/4x4 shaft, however, it doesn't engage with normal driving 4x2 so shouldn't be the cause. Approx. 6 months later, I went back to same tire shop and had them exchange tires with a completely different set (factory recommended size LT275/65/18) thinking it still had to be the tires- no fix.

So then on to other things: I started with changing out the rear differential fluid- no fix. I also put on new rear brakes and rotors- no fix. I put on new rear shocks- no fix. I also took off the parking brakes and inspected all cables and housing, which could apparently stick sometimes- no fix. I cleaned all contact areas of wheels and rotors onto the wheel studs to be sure there were no abnormalities- no fix. I even took off the front 2" leveling kit and tried driving without, no fix. (But this was never a problem before.) Keep thinking it could be something more deep in the rear-differential, but most reports say it would be very rough and noisy/grinding-which it isn't. So after probably 6-7 trips to at least 3-4 shops and perhaps $600 later I now have newer tires and a spare d-shaft, which Ford won't take back by the way, and I still have the vibration.

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I have a rough chatter noise coming from the rear end. It happens when starting off up till about 25mph. It rattles the cab a little and sounds real rough. It also happens when turning up hill, causes lots of vibrations in the cab. Some have mentioned it could be the rear differential needing a friction modifier or the u-joints needs some special lube? Its an 05 F150 with 62K miles.

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Since I bought this '05 Ex, I have had a driveline vibration. Not bad mind you... just barely noticeable when I let off the gas going 50+ mph. I had my local Ford dealer change the Ujoints and it worked a little.

I just installed Firestone Air Bags on the rear axle. I put 20 lbs. of pressure in them and it raised the rear exactly 1 inch (I measured before and after). After the air bags were in and pressurized and the rear lifted 1 inch, I took it for a drive. WOW! The driveline vibration is completely gone. Smooth as glass.

Question that I need opinions on from those who have more experience with an Ex than I do: Did my rear springs sag enough to cause a driveline vibration? And did the lifting of 1 inch put it BACK to stock height so that the driveline is now correct?

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1st. I get a vibration at about 67 mph that seems to pulsate.

2nd. I get a similar vibration at about 1200 rpm in park. This one seems to be much worse when i lift my foot from the accelerator.

I have had-the truck about a month, and just had the tires rotated and balanced.

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The problem resurfaced again at about 37,000 miles, but the dealership claimed that since I was out of warranty. Being handy, I replaced the rotors myself, but now, about 15,000 miles later, I'm experiencing this issue again. Is this just a common problem i will have to live with? I don't tow anything, and i rarely load the bed with anything. Maybe a trip to the hardware store once a quarter and i load a motorcycle into the bed two or three times a year.

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Description of problem: About 2 weeks/500 miles ago, truck developed a scraping/squeaking sound. I thought maybe something was rubbing on the driveshaft, but inspection revealed no likely candidate, nor disturbed metal on the shaft.

Over the course of the next 500 miles, it's gotten worse, so that current symptoms exhibit themselves (to one degree or another) 80% of the time. The symptoms are:

- Worst on first drive of day, on first mile.
- Sound produced somewhere between scrape and squeak.
- Vibration noticed throughout cab and through steering wheel ONLY when foot off clutch...smooth as soon as clutch depressed.
- Giving it a little gas (at constant speed) usually smooths out symptoms somewhat.
- Recently had bed loaded to gross. Vibrations went away, to return once bed empty.
- MT fluid found to be full, in good condition, and with 15k mi since change.

So, what's up? Given that a load in the bed improves things, I was thinking U-joints: but the driveshaft spins in neutral, too, so why would pressing the clutch change anything? I also thought about tired clutch bearings, but everything I've read says pressing the clutch makes things worse, not better.

Is it worth examining the tranny-to-engine bolts?

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The next day I found that cylinders 5, 6, 7, and 8 were all having issues. At this point I also had an "O2 stuck lean" code so I pulled the plugs and found all four brand new plugs fouled and smelling like gas and an ehaust that smelled like raw fuel. This led me to replace the O2 sensor on the drivers side. With the new O2 my lean code disappeared but I still had a rough idle.

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