TSB 2022–2024 F150 Harsh 3-4, 4-5 Upshifts — 26-2408

[F150 Tremor Forum]

Technical Service Bulletin · TSB 26-2408

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 the Parts list to add 3.3L to W520514-S440, and add L1MZ-7Z490-G valve body separator plate for Aviator. Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: * Harsh 3-4, 4-5 upshifts * Harsh 5-3, 4-3 downshifts * Harsh reverse engagements These symptoms may be worse when cold. This may be due to the F clutch friction plates brinelling into the clutch and planetary container cylinder (7B177).

Supersedes: TSB 26-2309

Sources​

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

Details from NHTSA as of Oct 9, 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.