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Old 11-19-2020, 06:36 PM   #1
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Brand: Thor Motor Coach
Model: Four Winds, 31W
State: Pennsylvania
Posts: 4
THOR #17122
Class C Driveline Vibration

Hi Folks,
Have been monitoring the Forum for some time. Really good stuff. First post though. Bear with my "newbieness".

Any of you out there know of or have any experience with drive-train vibration in a Class C? Kindof a long story--so I’ll summarize. I have a Thor Four Winds 31W--2016--purchased in June of 2019 with 22,000 miles on it. In February of 2020, I took it to a local Ford dealer (their commercial truck shop) for inspection, front end alignment, steering stabilizer replacement and heavy duty sway bar installation. At the time, when they took it for a test drive, they indicated they felt a significant vibration and suggested having the drive shaft balanced. I had not really noticed the vibration previously, but then the unit was new to us and after having towed a 5th wheel with a 3500 dually for a number of years, the Class C diving experience was totally new. So, I had that work done too. They sub’d it out to a local shop that specializes in drive shaft work.

What I noticed, once I got it back, is that there still seems to be drive-train vibration that begins low cycle vibration at about 45 mph, peaks at about 55 and then starts to decrease at 65. Since there’s still warranty left, I have it back at the Ford garage for evaluation.

I’ve tried researching the Forum to see if there’s any history on this topic, but have not found anything. So I thought it was time to put the question out there to you experts to see if anyone’s been down this road before and can help me help the shop resolve this.

Thanks in advance for any insights you might have.

Dave
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Old 11-19-2020, 06:57 PM   #2
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 2,245
THOR #6411
Quote:
Originally Posted by Fish View Post
Hi Folks,
Have been monitoring the Forum for some time. Really good stuff. First post though. Bear with my "newbieness".

Any of you out there know of or have any experience with drive-train vibration in a Class C? Kindof a long story--so I’ll summarize. I have a Thor Four Winds 31W--2016--purchased in June of 2019 with 22,000 miles on it. In February of 2020, I took it to a local Ford dealer (their commercial truck shop) for inspection, front end alignment, steering stabilizer replacement and heavy duty sway bar installation. At the time, when they took it for a test drive, they indicated they felt a significant vibration and suggested having the drive shaft balanced. I had not really noticed the vibration previously, but then the unit was new to us and after having towed a 5th wheel with a 3500 dually for a number of years, the Class C diving experience was totally new. So, I had that work done too. They sub’d it out to a local shop that specializes in drive shaft work.

What I noticed, once I got it back, is that there still seems to be drive-train vibration that begins low cycle vibration at about 45 mph, peaks at about 55 and then starts to decrease at 65. Since there’s still warranty left, I have it back at the Ford garage for evaluation.

I’ve tried researching the Forum to see if there’s any history on this topic, but have not found anything. So I thought it was time to put the question out there to you experts to see if anyone’s been down this road before and can help me help the shop resolve this.

Thanks in advance for any insights you might have.

Dave
The Ford 90 degree V-10 has three vibration periods. Two are somewhat canceled by the engine's balance shafts and engine motor mounts. The third one is around 2,000 rpm and again in the 4,400 rpm range. Mine is severe enough to make the tailpipe hit the heat shield on the coach.

You could have a driveshaft that is out of balance but MorRyde usually does a good job of balancing the drive shaft before Thor MC gets the chassis. Inline 5 cylinder engines are notorious for the vibrations. So much so that they require active engine mounts. Putting two together in a 90 degree engine does not make then vibrate any less.
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Old 11-19-2020, 07:55 PM   #3
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Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 16,846
THOR #8860
I know that it's early for this type of failure... Could it be a universal joint going bad?
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Old 11-20-2020, 12:16 AM   #4
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Brand: Thor Motor Coach
Model: Four Winds, 31W
State: Pennsylvania
Posts: 4
THOR #17122
Thanks for the feedback. I had not realized there'd be an engine contribution to the vibration issue.

Universals I believe were checked when they balanced the drive shafts. I have to wonder though whether the shop got the balancing process right. I also doubt they balanced both as a system.

D.
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Old 11-20-2020, 12:32 AM   #5
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Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 16,846
THOR #8860
If they the drives haft back in place, and didn't get it indexed correctly:
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Old 11-22-2020, 12:24 AM   #6
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Brand: Thor Motor Coach
State: Florida
Posts: 18
THOR #17202
My 2019 E450 started with a driveline humming/grinding at 1500 miles. It went to ford and MORryde suggested a driveshaft realignment and balance. It helped quiet the noise but it was still present. Manageable, but present.

At 10000 miles, it began to get really loud again. 63-69 mph range in sixth gear, under light constant throttle, it would just sing. I mean vibrating the floor in the back.

Once again, it went back to get fixed. This time it was at MORryde's factory in Wakarusa while my Busch was getting repaired at Thor. Whatever they did made it worse.

So now it is at Gator Ford again and I was able to duplicate the problem for their technicians. They are thinking it is at least a bearing or the differential.

I took a sample of the differential gear oil before it went to ford and sent it to Blackstone labs. The fill plug is magnetic and had quite a bit of metal "fur" on it. Their report states that the oil had metal in it that is consistent with 36000 miles of wear. My coach has 12000 miles. So I'm hearing that the wear is accelerated 3 times more than it should be?

I am hoping whatever they do fixes it.
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Old 11-22-2020, 02:10 AM   #7
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Brand: Thor Motor Coach
Model: Four Winds, 31W
State: Pennsylvania
Posts: 4
THOR #17122
Well, interestingly enough, I talked to the Ford Service Advisor on Friday to get an update on their progress. They believe they've ID'd the issue--metal filings in the differential. Replacement parts are on order and I should know in a couple of weeks if this does the trick. I'm hopeful. Seems odd that this type of failure would occur relatively early.

D...
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Old 11-22-2020, 02:28 AM   #8
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Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 2,483
THOR #13932
I understand running over a mattress can cause a vibration.

The last drives haft I had balanced made a wonderful difference in the entire vehicle at almost any rpm. I watched him heat a little spot the size of a quarter, get it to straw colored, quench it with a wet rag, and then look for the next GRAM to work out of it.

I'm having a bit of doubt about shavings causing vibration. Vibration may have caused shavings though.
And
If it's the rear end I'd have noticed, I'm pretty sure, a difference in loaded and unloaded rear end(accelerating, decelerating, coasting) and probably a difference in making a right turn versus a left.
Or
Not.

I'd sure get a second(and then some) opinion, and/or a guaranteed in writing money back if this is just a
Parts cannon
Shot at
'we think this'
And they aren't even close to right.

I have sincere doubts about their diagnosis.
Lots of rear end things can do this, pinion wise.
Shavings are a sign, not a cause.

As said above, by Beau who has a HUGE knowledge base:
It might just be the harmonics of it all, and I'll add to his perfect reasoning: the people telling you of it has triggered your awareness.
I'd sure bet on that.

Aside :
My 70 1/2 z28 LT1 350 hit resonance and was VERY noticeable. Solid motor and trans Mounts made the whole car kinda have a not so subliminal hula roll to it. It happened at I think 2150 rpm... At exactly 55mph back in 55 mph days.

This is for sure one of those:
Until it's bad enough, or your mechanics diagnosis skills are good enough, leave it alone until it can DEFINITELY be diagnosed.

A differential is not a thing you want a dealership
Read, remove, replace type mechanic touching.
He changed a headlight yesterday and will work on your rear end tomorrow.

Go to an offroad shop and have them look at it.
A dealership will change 3 diffs a year on the far outside guess and maybe only 1 in 3 years, but an offroad shop does 5 drive lines a week.
As said above, a dealer can sure make it worse.
Jack of all master of none, or a specialist.
Choose the specialist.
Your differential, once out of warranty, should have nothing ever ever to do with a Ford dealership mechanic.
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