Ford F-350 Sd, Ford F-450 Sd, Ford F-550 Sd, Ford F-600 Sd, model year 2021. Filed by Ford Motor Company and reported to NHTSA on 25 May 2021. 17,616 vehicles potentially affected.
What the notice says Ford Motor Company (Ford) is recalling certain 2021 F-350, F-450, F-550, and F-600 vehicles equipped with dual rear wheels and front wheel hub extenders. The front wheel hub extenders may be improperly attached to the front rotor hub assemblies, which could result in separation of the wheels and wheel extenders from …
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
Ford's own number for this recall: 21S26. That is the number on the owner letter and on the dealer paperwork. 21V390 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 21V390 cover?
- Ford F-350 SD, Ford F-450 SD, Ford F-550 SD, Ford F-600 SD, model year 2021.
- What is wrong with them?
- Ford Motor Company (Ford) is recalling certain 2021 F-350, F-450, F-550, and F-600 vehicles equipped with dual rear wheels and front wheel hub extenders.
- What can happen if it is not put right?
- A detached wheel and wheel extender can increase the risk of a crash.
- Is there a fix yet?
- Yes, and it is free. Owners are instructed not to drive their vehicles until the torque of the wheel extender nuts can be verified. Dealers will inspect and tighten the front wheel hub extender nuts, free of charge. Owner notification letters were mailed on June 18, 2021.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. Ford calls this recall 21S26, which is the number on the owner letter and the dealer paperwork.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “A detached wheel and wheel extender can increase the risk of a crash.”
affected
in the notice
caught
| Campaign | 21V390 |
|---|---|
| Filed by | Ford Motor Company |
| System at fault | Power Train:Axle Hubs |
| Reported to NHTSA | 25 May 2021 |
| Model years | 2021-2021 |
| Vehicles named | FORD F-350 SD, FORD F-450 SD, FORD F-550 SD, FORD F-600 SD |
This is not an ordinary campaign.
- Owners are told not to drive the vehicle at all. NHTSA applies this to a small minority of campaigns. 28 of the 1,399 we currently hold.
What the notice says today
The consequence
A detached wheel and wheel extender can increase the risk of a crash.
The remedy
Owners are instructed not to drive their vehicles until the torque of the wheel extender nuts can be verified. Dealers will inspect and tighten the front wheel hub extender nuts, free of charge. Owner notification letters were mailed on June 18, 2021. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 21S26.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 816 notices in the record whose component field names power train. Across that group the median wait before owners were written to was 42 days.
Last checked . No change has been recorded in the wording.
The models named here, across their whole recall history
- Ford F-350 SD recalls: 71 US campaigns
- Ford F-450 SD recalls: 61 US campaigns
- Ford F-550 SD recalls: 50 US campaigns
- Ford F-600 SD recalls: 11 US campaigns
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 21V390, wording as read on 16 September 2026. https://carsmultiverse.com/recall/21v390/
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other Ford notices we hold
- 26V579: 2026-2027 Transit
- 26V578: 2023-2027 F-150
- 26V577: 2026 F-150
- 26V576: 2026 F-150
- 26V550: 2026 Maverick, F-150, and Bronco Sport
- 26V548: 2026 Explorer, Bronco, Bronco Sport, Mustang, and Ranger
- 26V547: 2024-2026 Mustang
- 26V532: 2026 Explorer
All 776 Ford campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 21V390 on 23 August 2026, they were:
- Defect summary
d9b19bd8 - Consequence
7fa7c128 - Remedy
ec9bb750
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 21V390 · how the whole register is watched
This notice names one vehicle among several registers that have written about it. Every notice this site holds for the Ford F-350 SD, in all seven, is kept on that vehicle's own page, with the newest in each.
Put this notice on your site
A small badge that links here and names the register's reference. It costs one line of HTML and needs no key.
The badge is free to use. It links to this page and nowhere else, and it never shows advertising.
Owners of these cars
No register publishes what happens after the letter. Owners do: tell us, in two taps.
Anonymous: no account, no cookie, nothing you type is stored beyond these choices. Figures appear once 3 owners have answered, and are published with the record under CC BY 4.0.