Some 2021-2022 F-250 vehicles equipped with a 6.7L engine, 10.5 inch Sterling rear axle with a 3.55 gear...

Bulletin number

SSM 50237

Component

Power train

Summary

Some 2021-2022 F-250 vehicles equipped with a 6.7L engine, 10.5 inch Sterling rear axle with a 3.55 gear ratio (tag S403N), and four-wheel drive (4WD) built on 01-Jun-2021 and through 01-Oct-2021 may exhibit a driveline vibration and/or growl/roar noise between 1700-2100 RPM. Before performing normal diagnostics in the Workshop Manual (WSM), inspect the rear axle to verify if a damper is installed on the pinion flange. If a damper is present, refer to WSM, Section 100-04 for normal diagnostics. If no damper is present, replace the rear axle drive pinion flange using service part number HC3Z-4851-A. Also, replace the rear pinion seal. Refer to WSM, Section 205-02. For claiming, use causal part 4001 and applicable labor operations in Section 04 of the Service Labor Time Standards (SLTS) Manual.

Owners of these vehicles have filed 48 complaints in the transmission category.