Clunking Noise in Rear End

[MrEmGallegos]

Saw this posted in another forum and wanted to share. Looks like there's an official TSB now which is referenced in the linked video. Anyone able to download it and share the actual document? TSB 21-2253 he says.

Does anyone have a list of the part numbers listed in the video? The video is too grainy to screenshot.
After taking my truck in and getting the u bolts tightened a couple weeks ago, the issue has returned.

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[Garyraw]

Has anyone else on here seen this on your brand new 2021 F150?

 

[UGADawg96]

Has anyone else on here seen this on your brand new 2021 F150?

https://www.f150gen14.com/forum/threads/rust-on-rear-end-of-2021-f-150-any-others.1479/

 

[Tyler1986]

Following this thread. I started noticing the exact sounds mentioned in this post a week ago. My truck has 4200km on it. I only notice it when going up or down my driveway and an angle. It’s super frustrating and almost embarrassing when there are people around. Thanks to this thread I will be checking things out when I get home from work.

 

[DaftJak]

Saw this posted in another forum and wanted to share. Looks like there's an official TSB now which is referenced in the linked video. Anyone able to download it and share the actual document? TSB 21-2253 he says.

This TSB fixed the noise for me! Backordered parts came in couple weeks ago but just got the work done today, no more clunking or popping!

 

[zamco17]

My 2021 went in Today for the 3rd time for this problem, first two times No luck. This time will be the first time that it has been for the TSB however. Parts took a month to come in. Will find out tomorrow if the tsb is going to be the solution.

 

[zamco17]

My 2021 went in Today for the 3rd time for this problem, first two times No luck. This time will be the first time that it has been for the TSB however. Parts took a month to come in. Will find out tomorrow if the tsb is going to be the solution.

‘The TSB worked-the clunk is gone!! Finally!

 

[GFDF150]

‘The TSB worked-the clunk is gone!! Finally!

That’s good news! Now I’ll get my dealer to order the parts!

 

[Lpetters84]

‘The TSB worked-the clunk is gone!! Finally!

Good to hear! I’ve been waiting on parts for 4 weeks now.

 

[Roady]

Good to hear! I’ve been waiting on parts for 4 weeks now.

Just a FYI on this issue. Mine clunking started at 1200 miles and I was unable to get it to the shop until 2800 miles. I did notice it progressively getting worse but it was the earliest I could get it seen. They called me on Friday, the day it was in the shop and let me know they had to order parts. I asked if I could pick it up and have it while they waited for the parts and they said no. There was a component failure related to the TSB and it was not safe to drive. So I'm posting this as warning not to let this go unchecked. Not worth getting into a accident. Have it checked out ASAP. I'm betting this will turn into a full blown recall at some point.

 

[baggs32]

Just a FYI on this issue. Mine clunking started at 1200 miles and I was unable to get it to the shop until 2800 miles. I did notice it progressively getting worse but it was the earliest I could get it seen. They called me on Friday, the day it was in the shop and let me know they had to order parts. I asked if I could pick it up and have it while they waited for the parts and they said no. There was a component failure related to the TSB and it was not safe to drive. So I'm posting this as warning not to let this go unchecked. Not worth getting into a accident. Have it checked out ASAP. I'm betting this will turn into a full blown recall at some point.

That sounds fishy to me. If you do a couple of quick searches you will see very clearly that this noise has been happening in F150 generations for nearly a decade. The parts in the TSB are replacement bolts and nuts which are necessary because once they remove them to apply the grease, they can't reuse them due to the type of bolt and nuts used. The explanation given on another forum was that you can tighten the nuts to the bolts all you want but once you back the nuts out the bolts have to be discarded and replaced. Something to do with how they are threaded.

If they are telling you something is broken you might want to get more info about exactly what that was. This has never been a safety concern based on everything I've read, and it seems they are either lying to you or they found something unrelated that was broken. Maybe they already loosened the U Bolt nuts and realized they can't tighten them back up for you.

 

[Roady]

That sounds fishy to me. If you do a couple of quick searches you will see very clearly that this noise has been happening in F150 generations for nearly a decade. The parts in the TSB are replacement bolts and nuts which are necessary because once they remove them to apply the grease, they can't reuse them due to the type of bolt and nuts used. The explanation given on another forum was that you can tighten the nuts to the bolts all you want but once you back the nuts out the bolts have to be discarded and replaced. Something to do with how they are threaded.

If they are telling you something is broken you might want to get more info about exactly what that was. This has never been a safety concern based on everything I've read, and it seems they are either lying to you or they found something unrelated that was broken. Maybe they already loosened the U Bolt nuts and realized they can't tighten them back up for you.

@baggs32 Agreed, something does not pass the smell test here. I will be picking up the truck today or tomorrow and will press them for more information. Will report back.

 

[Chrislorl]

Had the same in mine. It sounded like the rear but we traced it to the driver's side torsion support bar. I found it by rocking the truck and having a buddy climb under. After a few min's we tracked it to this. You could actually move it by hand. When I took it in the tech told me he had seen a bunch that were not torqued correctly. It is fixed. It was the bolt that the yellow arrow is pointing to.

 

[Craigr]

My truck goes in Monday to have the tsb completed. I was told it's not the grease issue from previous years.

We will see on Monday.

 

[Lpetters84]

My truck goes in Monday to have the tsb completed. I was told it's not the grease issue from previous years.

We will see on Monday.

I’m 3 months in and still waiting on my farm parts. Good luck on Monday!

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