Bump at stop and acceleration?

P. A. Schilke

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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.
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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.
 

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.
 

EJH

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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.
 

silverflash

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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.
 

CO2Ranger

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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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