Missing Snap Ring Can Drop the Driveline on 3,894 New 2027 Freightliners and Western Stars

NHTSA logged the campaign as 26V737000 on Nov. 6. Cummins, not the Freightliner or Western Star dealer, will inspect and replace drivelines as necessary at no charge. Owner notification letters are not scheduled to go out until Jan. 5, 2027, which leaves roughly two months of trucks running on hardware nobody has verified. Daimler's internal number for the campaign is F1046; owners can reach DTNA at 800-547-0712 or Cummins at 800-286-6467.

The federal recall data describes the defect across all 3,894 units in four words: driveline may separate. Daimler filed a second, much smaller campaign the same day, 26V736000, covering seven trucks whose certification labels carry the wrong Gross Axle Weight Rating — a Part 567 compliance miss whose remedy is still under development.

A driveline recall in which the engine maker does the wrenching still catches shops off guard. It should not. Cummins closed its $2.9 billion acquisition of Meritor in August 2022 and framed the deal around axle and brake technology, and it has been selling drivetrain hardware into Class 8 build slots ever since. On this campaign the component is Cummins', so the inspection, the replacement parts and the labor claim are Cummins' too.

That distinction matters more than it sounds. A truck carrying an F1046 VIN that rolls into the wrong service counter is how a short inspection turns into a week of waiting while two companies work out who owns the claim.

Any 2027 Freightliner or Western Star delivered this year deserves a VIN check against 26V737. A pre-delivery inspection does not catch a snap ring buried inside a slip yoke assembly, and neither does a driver walkaround. Until the letters arrive in January, treat driveline vibration, a clunk on takeoff or a new noise under load as a reason to put the truck on a lift that day rather than slot it in for next week — and walk the symptom through the free diagnostic guides for driveline faults before anyone condemns a component.

Crews are also working on trucks most of them have not seen before. The specs and fitment data for the Cascadia, 49X and M2 will tell you which driveline configuration sits under the frame before someone pulls a yoke. And if the inspection turns up wear beyond the missing ring — a scored slip yoke, a u-joint that has been running loaded — those are widely interchanged components, so check the interchange on the part number rather than paying OEM list on repairs this recall will not cover.