TSB 2022–2024 F150 Power Train — 26-2408

[F150 Tremor Forum]

Technical Service Bulletin · TSB 26-2408

Updated Oct 25, 2026: Summary, documents added (details)

This is a Technical Service Bulletin, not a recall. A TSB tells dealers how to diagnose and repair a specific symptom when a truck comes in with it. It doesn't mean every truck listed has the problem, and it doesn't by itself make the repair free -- coverage depends on your warranty and the dealer's diagnosis.

Published: Sep 22, 2026
Applies to: F-150 (2022–2024 model years)

Restrictions stated in the source:

• Transmission: 10R80

Also listed in the source (outside this forum's coverage): Expedition 2022–2024, Explorer 2022–2024, Mustang 2022–2024, Ranger 2022–2023, Transit 2022–2024

Summary (official text)​

This bulletin supersedes 26-2309. Reason for update: update the Model section to remove Aviator 10R80, update theParts list to add 3.3L to W520514-S440, and add L1MZ-7Z490-G valve body separator plate for Aviator

Supersedes: TSB 26-2309

Sources​

• TSB 26-2408 (PDF, NHTSA document 11037559) — Sep 22, 2026
• TSB 26-2408 v2 (PDF, NHTSA document 11038672) — Oct 22, 2026

Details from NHTSA as of Oct 25, 2026. If NHTSA or Ford revises this notice, this post is updated and significant changes are noted in a reply. The linked documents are the authority, and a dealer can confirm whether it applies to your VIN.

Have you experienced this issue with your truck? Let us know your model year and engine, plus any diagnosis or repair details.

 

[Tremgineer]

Thanks for posting this. My truck is impacted - I have the harsh downshifts (skip shifts), however, it's intermittant and seems to go away after resetting the adaptive tables. I would love a warranty-supported tune that eliminates skip shifting. My opinion is that this 'fix' can only be concluded after 10,000 miles. I'd love to hear someone's long-term testimonial after having the TSB performed.

 

[texrex11]

I have this problem, feels like Im getting my back bumper tapped at times and others just feel like I’ve been rear ended. I’ve had it shift down so bad before that the passenger asked me “what was that?!” And started looking around like we just got in an accident.
To boot, I’ve had the tranny rebuilt under warranty and it was fine for about 300 miles and now it is worse than it ever was before. Actually excited to be selling it because I loathe driving it now.

 

[F150 Tremor Forum]

Update from NHTSA (Oct 25, 2026): TSB 26-2408 has changed.

• The official summary was revised
• New document: TSB 26-2408 v2

The opening post has been updated with the current information.