TSB 2026 Super Duty Poor Shift Quality — 26-2406

[Ford Tremor Forum]

Technical Service Bulletin · TSB 26-2406

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 5, 2026
Applies to: F-250, F-350 (2026 model year)

Restrictions stated in the source:

• Engine: 6.7L Diesel Engine / 7.3L Gas Engine
• Transmission: 10R140

Also listed in the source (outside this forum's coverage): F-450 SD 2026, F-550 SD 2026, F-650 SD 2026, F-750 SD 2026

Summary (official text)​

Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: • Poor shift quality • Illuminated powertrain malfunction (wrench) indicator with diagnostic trouble codes (DTCs) P2704 and P0771 stored in the powertrain control module (PCM)/transmission control module (TCM) This may be due to sticking valves in the main control valve body and/or damaged E clutch friction plates and/or E clutch steel plates. Additional model information: • 6.7L Diesel Engine • 7.3L Gas Engine • 10R140 Automatic Transmission

Sources​

• TSB 26-2406 (PDF, NHTSA document 11037298) — Sep 5, 2026

Details from NHTSA as of Oct 7, 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.