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Old 10-26-2020, 08:48 PM   #1
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Location: Hinton, Alberta, Canada
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Sunseeker 2650 CDWS Vibration

Our motorhome, on an 2015 E450 Ford chassis with 110,000 kms, has a noticeable vibration, starting at about 65 kms per hour, mostly disappearing at about 90kmph. The tires are new and balanced. My suspicion is something with the driveshafts (3) or steady bearings (2) or the u-joints (3). Has anyone else had this problem and how was it fixed? I am thinking of dropping the driveshafts and checking all the u-joints, but I think it has something to do with balancing the whole drive train, so I am reluctant to wrestle with all that iron just to have it all dropped anyway for balancing. After 2 years, I have got to get this fixed and I have a driveline shop picked out, but thought I would check with this forum first. Am I missing another source for the vibration?
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Old 10-27-2020, 11:57 AM   #2
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Quote:
Originally Posted by tingefamily View Post
Our motorhome, on an 2015 E450 Ford chassis with 110,000 kms, has a noticeable vibration, starting at about 65 kms per hour, mostly disappearing at about 90kmph. The tires are new and balanced. My suspicion is something with the driveshafts (3) or steady bearings (2) or the u-joints (3). Has anyone else had this problem and how was it fixed? I am thinking of dropping the driveshafts and checking all the u-joints, but I think it has something to do with balancing the whole drive train, so I am reluctant to wrestle with all that iron just to have it all dropped anyway for balancing. After 2 years, I have got to get this fixed and I have a driveline shop picked out, but thought I would check with this forum first. Am I missing another source for the vibration?
I had a weight come off the driveshaft of our 2010 E450 chassis Sunseeker, which instantly caused a vibration. If you have yours rebalanced, be aware that if your wheelbase was extended, as most are, Forest River rebalances the entire assembly of the added driveshaft section plus the original sections. If you rebalance only the section that lost a weight (if you identify it), you'll throw the assembly out of balance. Be sure the shop can balance the entire three section assembly together, at least 3500 rpm (about 60 mph), with 4000 rpm preferred. The first shop I took mine to only did a section at a time, and then only to 1800 rpm. That didn't work.

Of course, this doesn't really answer your question, and yes, the problem could just be u-joints or steady bearings. Look very closely with good light and you might find where a weight is missing. Mine were painted after balancing, so the unpainted spot was the clue where the weight was missing. If you can find a good shop to rebalance it, it may be worthwhile to have it balanced and replace the u-joints and bearings all at once, considering the mileage your chassis has. The balance was about $125. I replaced the u-joints with new ones that had grease fittings, even though none seemed to be bad.

Here's a link to my full, and quite long, discussion.

https://www.forestriverforums.com/fo...oad-67039.html
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2011 Sunseeker 3100
2016 Ford Edge Toad
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Old 10-28-2020, 12:37 PM   #3
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Originally Posted by RamblerGuy View Post
I had a weight come off the driveshaft of our 2010 E450 chassis Sunseeker, which instantly caused a vibration. If you have yours rebalanced, be aware that if your wheelbase was extended, as most are, Forest River rebalances the entire assembly of the added driveshaft section plus the original sections. If you rebalance only the section that lost a weight (if you identify it), you'll throw the assembly out of balance. Be sure the shop can balance the entire three section assembly together, at least 3500 rpm (about 60 mph), with 4000 rpm preferred. The first shop I took mine to only did a section at a time, and then only to 1800 rpm. That didn't work.

Of course, this doesn't really answer your question, and yes, the problem could just be u-joints or steady bearings. Look very closely with good light and you might find where a weight is missing. Mine were painted after balancing, so the unpainted spot was the clue where the weight was missing. If you can find a good shop to rebalance it, it may be worthwhile to have it balanced and replace the u-joints and bearings all at once, considering the mileage your chassis has. The balance was about $125. I replaced the u-joints with new ones that had grease fittings, even though none seemed to be bad.

Here's a link to my full, and quite long, discussion.

https://www.forestriverforums.com/fo...oad-67039.html
We have a 2019 Sunseeker 2500TSF. It had a ‘harmonic vibration’ similar to the sound of driving on the ‘rumble strip’. It would start around 60 mph (96 km) and become substantially less at 66 mph (106 km) but still slightly present. We had the driveline re-balanced and while it helped with over-all vibration, it did not fix the problem. The actual fix was the addition of degree shims added to the rear axle, which corrects the pinion angle to the proper angle. Not particularly a cheap fix but it corrected the problem.
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2019 Sunseeker 2500TSF
Trekker Cap
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Old 10-29-2020, 09:02 PM   #4
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Quote:
Originally Posted by JohnandSandiOnTheRoad View Post
We have a 2019 Sunseeker 2500TSF. It had a ‘harmonic vibration’ similar to the sound of driving on the ‘rumble strip’. It would start around 60 mph (96 km) and become substantially less at 66 mph (106 km) but still slightly present. We had the driveline re-balanced and while it helped with over-all vibration, it did not fix the problem. The actual fix was the addition of degree shims added to the rear axle, which corrects the pinion angle to the proper angle. Not particularly a cheap fix but it corrected the problem.
Forest River I think other RV manufacturers had a lot of trouble with the E350 and E450's when Ford switched to their 6-speed transmission. I think they stopped delivery for weeks while FR and Ford figured out the fix. They eventually had to shim the rear axle to adjust the pinion angle. In my case, it ran smoothly before the weight came off, so the pinion angle adjustment should not have been part of the problem. I never got it balanced as smoothly as I would like. I checked the angles of all the driveshaft sections against the transmission and pinion angles, and they were all within the acceptable range.
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Old 10-29-2020, 09:47 PM   #5
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Location: Hinton, Alberta, Canada
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Thanks for the help. I have an appointment to have the driveline rebalanced and will let them remove it and balance it. The cost was not excessive and living in a small town far removed from the big city, more convenient. I'll let you all know if it fixed the problem. The shop also does differentials, so hopefully they will know if its the diff or the driveshaft.
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Old 10-30-2020, 03:34 AM   #6
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Needle bearings

All it takes is a single crushed needle bearing inside one u-joint to cause a vibration like that. I had one fail on a Dodge class B campervan, while going to see the solar eclipse. Up to 30MPH going up hills it was fine. Over that, it tried to shake itself apart. Going down hills, I could go faster. It was a long drive made even longer by limiting my speed up the hills, and everyone questioned if we would make it. Fortunately, u-joints are a cheap fix.
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