vibration, like driving on a rumblestrip - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 19 (permalink) Old 05-11-2019, 03:42 PM Thread Starter
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vibration, like driving on a rumblestrip

I have an 02 F250 superduty. A few months ago when hauling my horse trailer, is started randomly vibrating like I was driving on a rumble strip. There seemed to be no pattern to it other than hitting bumps that seemed to trigger it and make it stop. Doesn't matter if I'm hauling, under load, coasting, what speed I'm going. It's totally random other than bumps seeming to trigger and stop it. The other thing that will stop the vibration is switching it into 4WD (not locking hubs) It shifts smoothly, runs nicely and 4WD works normally. 2nd mechanic thought it was the torque converter clutch slipping. Went to my regular (1st mechanic) and flushed the transmission and that made no difference. I asked him to test drive truck for an opinion before flushing transmission and he did not. 2nd mechanic replaced the torque converter and that made no difference. He also did not test drive truck before replacing torque converter as asked. Took it to 3rd mechanic (diesel specialist) and he thought it was the transfer case because the vibration will stop when switched to 4WD but after he test drove it, he says that is not the problem. He said my rear end is bad. Said the drive shaft was moving in and out of the pinion and hitting bumps is triggering the vibration. Said he could tighten it but that would to solve the problem. Recommended replacing the rear axle with a low mileage used one. The first mechanic has already replaced the real axle twice in two years (first one turned out to be bent and ate multiple sets of rear tires) axle is still under warrantee so back to my first mechanic with the truck. I just dropped it off there. He has not yet test driven it but he does not believe it is the rear end. He thinks it is a broken shaft in the transmission. Sorry for the long story..... any thoughts?
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post #2 of 19 (permalink) Old 05-11-2019, 06:38 PM
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Re: vibration, like driving on a rumblestrip

Find 1 good mechanic lol . Sorry not trying to be smart . Too many different diagnoses . Are you able to get under the truck and move the rear driveshaft to get the same diagnostic determination?


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post #3 of 19 (permalink) Old 05-11-2019, 06:57 PM Thread Starter
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Re: vibration, like driving on a rumblestrip

I agree about finding 1 good mechanic! That's what I'm trying to do. ... sigh. I left the 1st mechanic due to him having to re-repair things too many time before getting it right. (in his defense, he has always stood by his work and eventually gotten it right) I left mechanic #2 because he misdiagnosed the problem due to not test driving it and now won't return my phone calls after doing a $700 repair it didn't need. So, the reason for move to mechanic #3. Thought I would do better with a garage that specialized in diesels. When he diagnosed it as a problem with the rear end, I was forced to go back to mechanic #1 as the axle is still under warranty but the mechanic (#1) won't honor that through another mechanic. And no, I was not able to get under the truck. Mechanic #3 thinks it's moving because the rear end is bad. Mechanic #1 thinks it's moving because the output shaft is broken in the transmission. He says it's an issue with the 4R100 transmissions. I'm afraid of getting yet another expensive repair that doesn't fix the problem of course.
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post #4 of 19 (permalink) Old 05-11-2019, 07:05 PM
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Re: vibration, like driving on a rumblestrip

How would he know the shaft in the transmission is broken if the driveline goes into the transfer case, then the transfer case bolts to the trans?

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post #5 of 19 (permalink) Old 05-11-2019, 07:13 PM
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Re: vibration, like driving on a rumblestrip

http://www.guzzle7pt3.com/nblube.php

This will fix your issue. You most likely have a bad bearing so you will have to replace it but it has the part number in the link. You might need a stub shaft too.

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post #6 of 19 (permalink) Old 05-11-2019, 08:11 PM Thread Starter
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Re: vibration, like driving on a rumblestrip

That's my concern. He can't know yet for sure. He is going by a notification from Ford (I believe he said) about known issues with the 4R100 transmissions and the symptoms my truck is having he says are exactly the same as described for the broken shaft in the transmissions. He said they did list a few ways to test this without tearing the transmission apart.
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post #7 of 19 (permalink) Old 05-11-2019, 10:10 PM
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If the output shaft was broken the truck would A: likely not move, B: you would still have the concern in 4x4. The transmission output shaft spins at all times the truck is moving reguardless of 2wd or in 4wd.

Try to confirm the rear end issue before digging elsewhere. If you find nothing wrong with it try lubing the spindle bearings . Have you checked your u joints ?
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post #8 of 19 (permalink) Old 05-12-2019, 01:30 AM
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Re: vibration, like driving on a rumblestrip

So did you read my link? When the locking hubs engage it locks the front axle shafts to the wheels to eliminate the vibration. It's a common problem. Pull the front axle apart.
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post #9 of 19 (permalink) Old 05-12-2019, 03:43 AM Thread Starter
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Re: vibration, like driving on a rumblestrip

I've replaced the ball joints, u joints, sway bar links and bushings and the front hubs. All new brakes - rotors, pads, caliper brackets and guide pins. .... torque converter, fuel lines... rebuilt the starter, replaced the starter and then replaced the starter again.....fuel water separator valve when fixing another fuel leak..... alternator. Replaced rear u joint and pinion seal. Then replaced the entire axle, rebuilt that rear end, then had to replace that axle when it was found to be bent (after ruining 3 sets of tires in less than 9 months)
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post #10 of 19 (permalink) Old 05-12-2019, 03:49 AM Thread Starter
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Re: vibration, like driving on a rumblestrip

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Originally Posted by Sbluke55 View Post
So did you read my link? When the locking hubs engage it locks the front axle shafts to the wheels to eliminate the vibration. It's a common problem. Pull the front axle apart.
Yes, I did read your link. I have manual locking hubs. The vibration stops when I flip the switch on the dash to 4WD but the hubs are not locked. ??
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