One more thought here. If you haven't had a super duty truck before, it's possible that you are feeling road washboard that you cannot feel in other vehicles. With my 2017 F450, I have a vibration on some stretches of highway - you can actually see the steering wheel moving up and down. It's worse in the right lane where the big trucks hang out. Because the vibration is only on certain highways, and is normally absent in the left lane, I concluded the issue is with the road, not the truck. It doesn't really bother me, but I might try replacing my fancy OEM "Ranch branded" shocks sometime to see if that changes anything.

When test driving many trucks, I noticed this effect much more on the short-bed SRW trucks.

Do you have any vibration on surface streets or just highways? Maybe try the left lane to see if it is different - assuming the road doesn't allow large trucks in the left lane.

 

Thanks soooo much for the reply. This morning I went back to the dealer. They are going to try a few things.
The vibration is really only prevalent on smooth highway. If there is washboarding or othe issues the vibration is not that noticeable if at all. I think it's a wheel or maybe one bad tire. The road force on one wheel was ,I think, on the edge. Thanks

 

I'm curious as to what does the Ford rep mean by all F350's vibrate? Are we talking the suspension going over bumps or stuff rattles or it vibrates over a smooth road? My F350 feels like a firm riding truck and when it hits bumps you can feel them, but I would not consider it to vibrate.

 

I also have the vibration on what appears to be smooth highway. I think there is a 30'-40' (just over 2/sec at highway speed) washboard due to heavy trucks. Try the left lane (or straddle two lanes) to see if that changes things.

 

Not to add salt to the wound here, but I have a 350 crew and it is smooth as glass on the freeway. One of the biggest issues I have is I frequently look down to see my self well in excess of 80mph and not even know it.

 

Now that you all have me paying more attention to it, I think my vibration at 70-75 MPH is tire related. I figured it was the highway because that's only where it happened. I don't drive 70 on surface streets!

 

I was just looking for solutions. I hate to babble on but;
At delivery, SRW 350 vibrated on smooth asphalt above 60. Two tires replaced. Steering wheel then oscillated above 60. One more Continental replaced. Now vibrating above 70. Dealer said nothing more they could do. Asked to replace all tires with Michelins. I paid 400.00 as upcharge. Still vibrate above 70. Ford does final repair attempt under Georgia lemon law rules. Worked on tires 4 hours, better, but still there. Go to arbitration for replacement. The Ford rep said all f350's vibrate due to stiff suspension. I told them we rode in a new 250 and it was smooth. Right, 250's have softer suspension.I lose. Go back to the dealer and beg for help. Don't like spending money to fix my 60,000 $ truck but I want it right and don't know where to start. Dealer is going to swap wheel set from truck on the lot. I pray that it's the fix. Thanks for listening

 

Sorry, but did I mention that my special order truck was delivered with 59 miles on the odometer, I think ford knew the vibration was there but decided to send it to the dealer for the fix. No proof however.

 

My 2011 had a vibration that deified all the usual attempts to fix it until they pulled the axle's and measured them. It turned out that one axle was out of specs and replacing it fixed the vibration. It's a long shot but worth a try if replacing the wheels doesn't work.
Gary

 

Man , I would love to meet the genius that took the time to find that problem. Brilliant

 

dhudec, I have a 2017 f250 with possibly the same issue. The worst of the vibrations is 68 mph. It also has smaller vibrations or shuttering at 3 different speeds. Mine also is felt on smooth roads. On very rough roads, of course, I can't feel anything but road. There is a difference in washboard and this vibration. If this vibration were normal, my truck would not be in the service dept 21 days so far. I posted on 2 other threads here as well. My dealer has changed 2 sets of continental tires, tested wheels for trueness, tested run-out on driveshaft, swapped tires/wheels from another truck (told me truck drove as smooth as glass although I wasn't able to drive), had field engineer test with digital vibration analyzer (stating tire/wheel assembly), checked shocks and suspension, and now in shop for day 10 to replace with Michelins. Ford is not approving to pay for different brand of tires. Ford also will not allow permanent swap of tires and wheels from other f250 because the finish is different. I'm 100% certain its not tires or wheels. Hearing your story helps me think its not a tranny problem. The shuttering I feel at different speeds is similar to my wife's 2012 grand Cherokee that has 83,000 miles and is in the shop with transmission issues. I drove 4 f250s before ordering mine and they drove GREAT. I have also been told the same about stiff suspension, frame, unsprung weight and I'm not settling this time. When I pick up my truck this time and it has not been corrected I am contacting a lemon law attorney. I'm not handling this alone. At this point I don't care if the truck fixed, I don't even want it. This is the 2nd ford in a row with an unfix-able problem. I truely hope yours is resolved with michelin tires. I will post with any new info. Thank you to all that are looking out for interest of other owners and not the reputation of Ford.

 

Someone posted that they were crawling around under there truck being nosey when they found the bolts holding the drive shaft (U-Joint caps) backed out halfway. He said he was able to hand tightened the screws they were so loose. Something to check because just one screw lost can make it vibrate as that's all balanced because it spins so fast. If so vibration is the least of your worries if the drive shaft lets go at speed.

 

What part of the axle was out of spec? You're talking about the axle shafts, right?

 

People chiming in here with a LOT more technical knowledge than I have; however, airing down the tires (specifically the rears) from 80 to 65ish helped the bounce/vibration I was experiencing. No clue if this would help you, but may be worth a shot in conjunction with everything else people are suggesting here.

 

I know this is on an 2017 F-150 but my neighbor had the same hard to find vibration that the dealer tried everything with and it turned out to be the rear crown and pinion. Now I thought at first that there was no chance that a crown and pinion could be the problem but it did fix it