Bump at stop and acceleration?

cory1848

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Hi Folks,

For those of you that have this condition, please file a formal complaint with Ford Customer Care. Enough complaints may force an engineering investigation.
Already have, one case worker passed on me on to another, the other said they were sending out an engineer and now wont return my calls. Left 5 voicemails in the past two weeks. Dealer confirmed only spoke to FSE via phone. Bottom line, I don't think they care. Lemon law is my only option left.
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CO2Ranger

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Does anyone else have the locking diff option as well? Maybe that has something to do with it.

CO2Ranger, how many miles on your 2021?

Hell, I may as well do my due diligence and contact my service dept. and see what they say. Doubt they'll fix anything but at least it will be documented as Cory mentioned. Wouldn't surprise me if a TSB came out as I've never experienced this much clunking in any vehicle. As mentioned, I'll update my post if any solutions come to fruition. Thanks guys.
300ish both of mine had/have locking diffs
 

cory1848

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Ford just authorized repurchase or replacement for mine. Have to decide but most likely repurchase as I don't think these issues have been addressed in later models. Not willing to risk driveline failure 50K down the road for this...
 

CO2Ranger

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Ford just authorized repurchase or replacement for mine. Have to decide but most likely repurchase as I don't think these issues have been addressed in later models. Not willing to risk driveline failure 50K down the road for this...
Just put Fox 2.0s to level the front. Bump is gone or greatly muted now. Can't feel it anymore. Weird... Haven't tested at highway speeds yet for potential vibration at higher speed but so far so good.
 

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Just put Fox 2.0s to level the front. Bump is gone or greatly muted now. Can't feel it anymore. Weird... Haven't tested at highway speeds yet for potential vibration at higher speed but so far so good.
Interesting. Please report back after you drive a bit more with the front level.

I have a mild version of the bump or rough downshifting when stopping quickly. Otherwise I have zero drivetrain issues. Acceleration, slow or ludicrous speed, is smooth. Park to reverse to drive to whatever is quiet and smooth.

I'll also add that is seems like Sport mode does not have this bump or rough downshifting on a quick stop. Is that what others notice? I need to drive more and stop quickly to get more data points though

I am hesitant to ask the dealer to look at this, for fear they will screw up something and I'll get a vibration elsewhere.

If raising the front an inch or two helps, I'd happily try that. I already have the Fox rears anyway.
 
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CO2Ranger

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Interesting. Please report back after you drive a bit more with the front level.

I have a mild version of the bump or rough downshifting when stopping quickly. Otherwise I have zero drivetrain issues. Acceleration, slow or ludicrous speed, is smooth. Park to reverse to drive to whatever is quiet and smooth.

I'll also add that is seems like Sport mode does not have this bump or rough downshifting on a quick stop. Is that what others notice? I need to drive more and stop quickly to get more data points though

I am hesitant to ask the dealer to look at this, for fear they will screw up something and I'll get a vibration elsewhere.

If raising the front an inch or two helps, I'd happily try that. I already have the Fox rears anyway.
Just a follow-up to this. It still clunks in certain situations but it's not as often.

Another thread has identified a possible culprit: that the splines are not sufficiently lubed on the axle at the slip joint (not a mechanic so the terminology might be a bit off).

Seems like a relatively painless job for a dealership, but first they'd have to recognize that as the problem and not attribute it to something else.
 

cory1848

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Just a follow-up to this. It still clunks in certain situations but it's not as often.

Another thread has identified a possible culprit: that the splines are not sufficiently lubed on the axle at the slip joint (not a mechanic so the terminology might be a bit off).

Seems like a relatively painless job for a dealership, but first they'd have to recognize that as the problem and not attribute it to something else.
Lubing the splines is a short term fix. They tried that with mine but they were very hesitant to even try it.
 

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I think the slip joint is the problem or 1 part of the problem, BUT the dealer just isn't using the right grease OR not cleaning things properly before doing so OR there is another component of the issue that is being ignored. Laziness reigns supreme at dealers IMHO. This sort of bump/thump is common across various makes and models and it's almost always due to the slip joint binding. that can be due to lack of lube OR, i am thinking maybe due to the bad angle we have in the rear which causes the other issue, vibes on acceleration from 0-10 mph or so. Perhaps that angle even tho slight, is just enough to prevent a smooth extension and retraction of the slip joint into andout of the xfer case output shaft area. There is a TSB out now that covers every year, 2019-2021, and i was set to take it in for it but i lack the confidence in the dealer to fix it right the first time and i don't have time right now to be without it. Once my schedule slows, i will take it in for it. Hopefully the TSB fix applied properly will lessen the thump as well. If it does, or doesn't, i am going to mention the slip joint needing cleaned then lubed with the proper blue grease made for it. There is a special grease for it and ford has it.

i have noticed folks on facebook complaining about the very same thump. So hopefully ford comes up with a tsb for this as well.....we shall see.
 

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I noticed mine is greatly reduced with a few tube sands in the bed. Got rid of the 10-15mph shudder I had as well. Those rear springs just hate being unloaded, regardless of what shocks are on it.

Generally speaking rides better too.
 

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I noticed mine is greatly reduced with a few tube sands in the bed. Got rid of the 10-15mph shudder I had as well. Those rear springs just hate being unloaded, regardless of what shocks are on it.

Generally speaking rides better too.
how did you get rid of the acceleration vibration?
 

CO2Ranger

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how did you get rid of the acceleration vibration?
Global rear leafs
how did you get rid of the acceleration vibration?
Tube sands help on stock springs. I ended up putting global Wildtrak springs on mine and have a fantastic ride and don't have shudder issues now.
 

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So I’ve had my 2019 for about 2.5 weeks I now have 1700 miles on it. I absolutely love my truck and have noticed it’s little quirks.
This numb is strange it’s not a clunk you can’t hear anything. It’s like a nudge it’s something, it reminds me of my old 94 when the knuckle got Loose in the drive shaft. It happens when I come to a complete stop and then when I go to accelerate. It’s ever so slight I did read someone else said they thought it was the suspension not being torqued to speck but that didn’t fix their bump.
My truck is a 19 XLT FX4 package. Just trying to see if anyone else has found the fix to this very little problem lol.
Thanks in advance
this issue has driven me absolutely crazy. When I first got the truck in 2019 it was doing this and I took it to the dealership multiple times because it seemed to be getting worse. They scheduled a specialist to come in and look at it and I rode along with him to show him the issue. He agrees it was odd and that it felt like a transmission issue. The outcome was that it definitely wasn’t the transmission, but they then said that the thump is normal.

Fast forward 2 years and I started getting phantom braking when leaving parking lots. I also had the pre-collision braking system so I turned that off and the thump stopped happening. I have yet to bring this up to the dealer but I’m due for a service soon so I’ll see what they have to say.

Hope this helps anyone experiencing this issue.
 

JoeyG60

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I have the same issue with my 2019 XLT FX4. In fact, it is why I joined this forum. I have had it to two different dealers, both said it was functioning normally. One even let me test drive a new one which actually does it too.

I agree with CO2Ranger It might be a suspension problem. I noticed it is gone with at approx 150# (or more) in the bed and when towing a trailer (1700# empty and 4700# loaded). A mechanic friend of mine took that tidbit of info and looked at the leaf springs. There is only about 1/2" to 3/4" space between the leaf springs and the bumpers on the helper springs. He feels it is the leafs hitting the bumpers on the helper springs. I plan on zip-tying blocks to the leafs to simulate larger helper spring bumpers so they are always touching each other. If that works, I will try larger rubber bumpers in the helper springs. If those work, I will bring it to both of the dealers and say, "Here's your fix." Of course, that was a lot of "ifs" I just listed.

Being extremely busy, it might take me a couple of weeks to get the tests done. If anyone else tries the wood blocks and/or larger bumpers before I do, let me know how it works. Of course, starting with mounting a camera under the truck to observe if this is really happening, might be a good place to start.
 
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EJH

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I have the same issue with my 2019 XLT FX4. In fact, it is why I joined this forum. I have had it to two different dealers, both said it was functioning normally. One even let me test drive a new one which actually does it too.

I agree with CO2Ranger It might be a suspension problem. I noticed it is gone with at approx 150# (or more) in the bed and when towing a trailer (1700# empty and 4700# loaded). A mechanic friend of mine took that tidbit of info and looked at the leaf springs. There is only about 1/2" to 3/4" space between the leaf springs and the bumpers on the helper springs. He feels it is the leafs hitting the bumpers on the helper springs. I plan on zip-tying blocks to the leafs to simulate larger helper spring bumpers so they are always touching each other. If that works, I will try larger rubber bumpers in the helper springs. If those work, I will bring it to both of the dealers and say, "Here's your fix." Of course, that was a lot of "ifs" I just listed.

Being extremely busy, it might take me a couple of weeks to get the tests done. If anyone else tries the wood blocks and/or larger bumpers before I do, let me know how it works. Of course, starting with mounting a camera under the truck to observe if this is really happening, might be a good place to start.
Interesting theory.

I have the same bump on stopping start, but like others here mine is more pronounced the warmer it is. Under 50-60 degrees F and the bump is usually gone. Hot summer days of 90-100 degrees have the bump the most pronounced. I don't understand how your suspension theory plays into the heat or cold affecting it? That's why I think it is the spline joint, with some expansion or contraction due to ambient temperature. I guess it's possible the same with this suspension, with regards to temperature?

I've had 250 or more pounds in the bed and it doesn't matter. In my case that's a rack, rooftop tent, cooler and a couple plastic bins of camping equipment. It didn't make a difference.

One thing that will be interesting for me, and I will post my observations here, is when I start towing in the warmer weather. So far my towing has all been in winter, near freezing temperatures. When I start towing at 60-70° and above this spring, it'll be interesting to see if I have the bump or not with the trailer.

If it is the leaf springs, I wonder if upgrading them to either the Tremor pack, or other aftermarket options, would fix things?
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