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Old 11-03-2014, 09:29 PM
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Rear end bounces @ 40-45 MPH

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  #46  
Old 12-08-2010, 09:38 AM
djjoshuad djjoshuad is offline
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I'm honestly taken aback that *any* dealer would play the "nature of the beast" card. I've heard it more than once now from different people and I just can't believe they are serious about that. I think they just don't know what the problem is and aren't willing to figure it out. Also, while it's technically correct that "harmonics" can cause issues like this, those harmonics only exist when something is out of balance.

I know I've beaten this to death... but I still think it's a driveshaft issue. I'm not trying to tell you what to do, but if I were in your place I think I'd spend a few bucks at a driveshaft specialist. You are entitled to a free fix, for sure... but your time spent at the dealer chasing that free fix is almost certainly worth more than what you would pay to have an expert balance your driveline. JM2C

I hope you get this fixed, and soon. I can't imagine how frustrated I'd be in your situation.
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  #47  
Old 12-08-2010, 09:41 AM
toypuller toypuller is offline
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Thom12, I've been following your thread because I had the same issue with my 05.

My experiences were very similar to yours and the result was the same. The engineer took my truck, drove it to the coffee shop, then came back to the dealer and said the hop was a characteristic of the truck. Total drive time for the test drive, 4 miles on a cold truck.

Ford is aware of "Superduty Hop". They developed a vibration dampener to try and address it. Unfortunately that didn't work. I had hoped that the new design wouldn't have the same issue. Overall there is a very small number of trucks that have the hop, but if you have it, it's maddening.

I tried everything to get my truck right. Drive shaft balancing, new rims/tires, vibration analysis. In the end, nothing solved the issue. I drove the truck with that hop for 5 years.

Keep on them and make them address the issue. These trucks cost a ton of money and it should be made right. If not, keep good records of everything that happens and get out of the vehicle some other way.
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  #48  
Old 12-08-2010, 09:54 AM
RaiderAZ RaiderAZ is offline
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I had the same problem with my 1996 f350 and have the same with my new 2011 f350. It does not happen a lot but over the years I noticed it is do to the spacing of the slabs of the concert on the road that has heavy semi truck traffic. There is a section of freeway that it happens every time i drive it but a section stopped doing it once the State repaved the highway in that section. It is just the right wheel base to make this hop take place and when it does your are correct it is terrible to experience. Not sure Ford will ever be able to fix it.
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  #49  
Old 12-08-2010, 09:58 AM
djjoshuad djjoshuad is offline
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I think if it was just a wheelbase on certain roads thing, it wouldn't be as easy to reproduce on other roads, and it would be far more common on the roads with the spacing you describe. While those conditions probably aren't comfortable to dive on... I think this issue is something else.

I'm pulling for Thom. I hope he has the tenacity to shove it back in the dealer's face when the time comes
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  #50  
Old 12-08-2010, 01:05 PM
RobertH RobertH is offline
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I wonder if something like the Landyot Radius Rod approach would work. Of course someone would have to make one to fit this new model. Or, something like the Roadmaster or some type of traction bar to see if it can help with the hop. Could be spring related due to unsprung weight.
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  #51  
Old 12-08-2010, 01:19 PM
Champ198 Champ198 is offline
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Thom, I'm sorry to hear that outcome. I'm dissapointed in Ford's response. This makes me wonder if I will have a similar outcome in the end.

If you need my VIN# so they can look it up in the system for evidence that at least one other victim out there is having similar problems, please let me know. There should be some OASIS records on file for me. I can send you a private message.

You are not alone. I would not let this one go. With this type of problem, it is easy for them to throw their hands up and walk away, hoping you go away too. Keep in mind one dealer did the same with me - they said "it is a characteristic of the truck" when in reality the drive shaft was part of the problem and was proven to be an issue when put on another vehicle.

They have not looked at your transmission or the rear axle from what I understand from your posts. There is nothing in the Ford brochure or warranty guide that says "vibration at 45 mph that will shake your kidney stones loose is 100% normal with the 2011 Ford F350". Please call Ford customer service and raise hades. I would also ask your dealer for this issue to be raised further up the chain. Often, maybe you can get some decision makers that can help.

My dealer has not rec'd the parts for my truck. When those come in, we'll try it again. I will post my results. So far, I'm encouraged but we don't know anything for sure yet.

Thom, keep us posted. -Duane
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  #52  
Old 12-08-2010, 06:01 PM
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First off, let my thank each and everyone of you for your support and input on this. If nothing else, this surely should show Ford how much we all care about thier product and we want them to live up to all the pre-release hype about how super the new super duty is!

In all reality, my dealership's service manager has been top notch trying to make this thing right. He agrees that it is pretty violent and I could tell by the sound of his voice yesterday that he did not want to give me the answer that the field engineer gave him. I am sure he must have felt like he was on a suiside mission when delivering that message.

I will be back home on Friday and be able to formulate my next steps after I visit the dealership in person. I will keep you posted. Duane, thanks for the offer and I let you know if I need it after my visit with the dealership.
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  #53  
Old 12-10-2010, 10:44 AM
Champ198 Champ198 is offline
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Thom, update on my end. (thanks for letting me use your thread)

I was wrong. I thought they had a drive shaft on order for me and that I had my original drive shaft put back on the truck. Dealer told me today that they had installed a different drive shaft on my truck last week and that I had been driving with it. It still has the bounce at 50 I told him. They have a new rear axle that just arrived for me. Dealer said the axle was on national backorder with no estimated time of availability, yet it showed up yesterday. I noticed that when it was 13 degress outside yesterday that my truck had very little to no vibration at 50 mph. It was like a new truck - very very smooth. On the other hand, when the outside temp warmed up into the 30's and low 40's the vibration was back with a vengence at 50mph and over 75mph. I mentioned this to the service manager by phone today. I will get the new rear axle installed next week and post an update after we make some test drives. I am greatly appreciative of their efforts so far and the service manager reiterated that something is definitely out of spec. This type of information will help others.
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  #54  
Old 12-10-2010, 10:56 AM
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Quote:
Originally Posted by Champ198 View Post
Thom, update on my end. (thanks for letting me use your thread)

I was wrong. I thought they had a drive shaft on order for me and that I had my original drive shaft put back on the truck. Dealer told me today that they had installed a different drive shaft on my truck last week and that I had been driving with it. It still has the bounce at 50 I told him. They have a new rear axle that just arrived for me. Dealer said the axle was on national backorder with no estimated time of availability, yet it showed up yesterday. I noticed that when it was 13 degress outside yesterday that my truck had very little to no vibration at 50 mph. It was like a new truck - very very smooth. On the other hand, when the outside temp warmed up into the 30's and low 40's the vibration was back with a vengence at 50mph and over 75mph. I mentioned this to the service manager by phone today. I will get the new rear axle installed next week and post an update after we make some test drives. I am greatly appreciative of their efforts so far and the service manager reiterated that something is definitely out of spec. This type of information will help others.
Is the new axle a 3.55 ELD? I heard there was a backorder delay on this axle until 11/29. Pardon my laziness for not reading through the entire thread, but this "bounce" is on LWB, F350s only?
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  #55  
Old 12-10-2010, 11:10 AM
Rickx Rickx is offline
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I have the same truck, without a 5th will prep package. the only "bounce I get is on concrete roads. If the road is smooth my truck rides smooth, through all speeds.

Are you tracking the time you're truck is in the shop and not available to you. Are you considering - boy, I hate to say it - The Lemon Law.
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  #56  
Old 12-10-2010, 11:27 AM
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Champ198 -- I finally read through the thread. Do you have a tonneau cover or cap on your truck? There was mention by some that didn't experience the bounce when they had either a cover or cap on. Aerodynamics are an interesting variable and wonder if this has been vetted out. Having driven some high end speed vehicles, I have seen what impact it can have. Granted, you would think a 8,000 pound vehicle would be immune to it, but that back end is fairly light compared to the rest of the vehicle.

You would also think that the Ford engineers have done wind tunnel testing and determine rear end down forces AND that they are acceptable considering the combination of tire pressure, springs, etc. involved.
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  #57  
Old 12-10-2010, 11:32 AM
Champ198 Champ198 is offline
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Nothing over the bed in my truck.
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  #58  
Old 12-10-2010, 01:09 PM
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Champ,
I do not feel you have hijacked my thread at all, matter of fact, getting inputs and info from other owners is why I started this topic, again thanks for the update and keep us informed... between us maybe we can finally get this resolved.

I arrived back in town last night and have a visit with the service manager this afternoon to discuss the issue.

Rickx, yes I have been keeping very close tabs on the time at the dealership, and yes as much as I love this truck, I am starting to consider it a lemon. Only problem I will have is in Florida to be a lemon, it has to be safety related or affect the resale value, so how much would someone be willing to pay for a 2011 F-350 LB CC with a rear end bounce? (place your bids low....LOL).

I will let you know what goes on at the dealership later today.
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  #59  
Old 12-10-2010, 01:54 PM
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I am about to order one of these trucks -4x4 crew short box. Has anyone dropped the rear tire pressure down to 50-55psi when empty & tryed it? If there is a tire pressure monitor, I know it won't be happy, but that's what I run empty with my 2000 F350.
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Old 12-10-2010, 01:57 PM
Y2KPSD Y2KPSD is offline
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Originally Posted by Thom12 View Post
Champ,
I do not feel you have hijacked my thread at all, matter of fact, getting inputs and info from other owners is why I started this topic, again thanks for the update and keep us informed... between us maybe we can finally get this resolved.

I arrived back in town last night and have a visit with the service manager this afternoon to discuss the issue.

Rickx, yes I have been keeping very close tabs on the time at the dealership, and yes as much as I love this truck, I am starting to consider it a lemon. Only problem I will have is in Florida to be a lemon, it has to be safety related or affect the resale value, so how much would someone be willing to pay for a 2011 F-350 LB CC with a rear end bounce? (place your bids low....LOL).

I will let you know what goes on at the dealership later today.
Ford has their arbritation route also.... If you win your are done. If you lose, you can still go other routes.. And won't cost any / much to try it.
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2005, 2011, 45mph, 70, article, bounces, bouncing, bronco, end, f250, f350, hop, hopping, mph, rear, truck

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