Vibration-Huming noise - Page 11 - Ford Transit USA Forum
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post #101 of 135 (permalink) Old 04-26-2016, 01:12:PM Thread Starter
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Will be interesting if the bearing that is being replaced toady is the source of the problem or if it is the shaft not being balanced... lotus eater was your shaft bent?

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post #102 of 135 (permalink) Old 04-26-2016, 05:19:PM
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They didn't replace the bearing. They assembled everything like it was and ordered a new shaft and I also hope the accessories like bearing etc.

I don't know if the shaft is really unbalanced. you can't see this with the naked eye :-)

The problem is, that I don't remember that there was this drone from the beginning. After I got the van in Jul 2015 I immediately began with the conversion and did not drive for month. So I think if it really is a unbalanced shaft, it should have been noticeable from the very beginning. Or is it possible, that the bearing is getting worse because of an unbalanced shaft..?

Yes, the more I think about it, the more it makes sense to me.

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post #103 of 135 (permalink) Old 04-26-2016, 05:22:PM Thread Starter
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I guess time will tell - my dealer just called - they took the differential apart and found that there was more damage then expected so had to order some more parts...I am not sure yet what is ordered but will stop by there on my way home tonight. it appears however by reading some comments on this forum that there maybe issues with the differential.

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post #104 of 135 (permalink) Old 04-26-2016, 05:30:PM
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Originally Posted by lotuseater View Post
So I think if it really is a unbalanced shaft, it should have been noticeable from the very beginning.

Or is it possible, that the bearing is getting worse because of an unbalanced shaft..?
My 96 F350 which I bought new and still have- had the driveshaft go out of balance at something like 200,000 miles.
Had a hard time finding someone with the right equipment to fix it- had to take the driveshaft 100 miles away to a drivetrain specialist get it rebalanced.

And yes an unbalanced driveshaft can damage bearings...
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post #105 of 135 (permalink) Old 04-26-2016, 05:47:PM
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@Ahoelk : When I get the new drive shaft and it is still there, they have to replace the differential as well. I mean what else could it be then ?

At which speed does droning start in your case ? Below 40 mph ?

@Budsky : How did you recognise the unbalance ? vibrating steering wheel?

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post #106 of 135 (permalink) Old 04-26-2016, 08:42:PM
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As for recognizing the vibration I don't recall exactly except a general vehicle vibe...I spent quite awhile trying to figure it out. I replaced the center carrier bearing thinking that was it- it wasn't.

Fooled around moving tires etc. I finally dropped the driveshaft and drove the truck with 4wd engaged, powering just the front wheels, and voila! Driveshaft.

So next I replaced all the U-joints thinking maybe they were worn, remember this truck was then at 200,000+ miles.
That wasn't it.

So I found a local fleet service place that had a driveshaft balancer- the guy there said the whole thing was hosed and he recommended replacement- fat chance as Ford gets almost $2000 for the complete drive shaft!

Finally found another shop that did a lot of custom 4x4 driveline work and the said they could fix it for $200. Took it to them and left it- got it back with the rubber damped steel donut missing and a few washers tack welded to the two shafts in several places as balancing weights.

So now it is smooth at all speeds except right at 35 mph- I suspect that is because I am missing the rubber damped steel donut that Ford added to suppress a "hum" at certain speeds. Not entirely happy with it but way better than it was when I took it in.

BTW I see one of those rubber damped steel donuts on the Transit driveshaft- but it is miniscule compared to the one on my F350- it must have weighed 10 lbs!

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post #107 of 135 (permalink) Old 04-27-2016, 12:10:AM
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A few days ago I had the ladders off my van for the first time since I got it back in January...pictures in one of my threads.

Anyway, coming home sans ladders, right around 40MPH there was a quite loud, annoying drone...woooop, woooooop, wooop, woooooop. Certainly anyone back behind the partition would have remarked "What the heck is that?"

I thought, "Well, that's interesting. Haven't heard that before". The next day, with the ladders back up, it was gone.

Obviously, having something on the roof can create some kind of "harmonic distortion". In my case, a ladder rack.

Funny...ladders on, no noise. Ladders off, annoying drone.

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post #108 of 135 (permalink) Old 04-27-2016, 01:18:PM Thread Starter
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That is weird and does make my wonder if the drone is related to the thin paper like roof construction after all....
I guess I will know when I get my van back from the dealer.

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post #109 of 135 (permalink) Old 04-27-2016, 02:06:PM
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Originally Posted by Ahoelk View Post
That is weird and does make my wonder if the drone is related to the thin paper like roof construction after all....
I guess I will know when I get my van back from the dealer.
Well, they found damage in your diff... so, that's not nothing. OR, they DID damage, but, don't want to cop to it.

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post #110 of 135 (permalink) Old 04-28-2016, 12:45:PM Thread Starter
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Got the van back - and it is fixed!! Drives like out should - it was the differential - every single bearing in there had excessive wear, my tech showed me the old bearings. He will be filling our a 'global report' on this - he believes that Ford may issue a TSB.

For diagnosis it is important he stated to use a stethoscope at the rear casing of the differential ----- not the front ---- you will hear the noise at the rear. My differential had no visible signs of wear on the outside, i.e. signs of fluid or seeping.

Glad this is finally resolved, it took 8 trips to the dealer but is driving well now -
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