The Recall Desk
Our severity:SevereNHTSA·23E079000·Announced 2023-10-11

Allison Transmission Recalls B3400 and B400R Models for Driveshaft Separation Risk

Allison Transmission is recalling specific B3400 and B400R models because the transmission yoke may separate, causing a sudden loss of drive power and increasing crash risk.

What this means for you

Our assessment, not the agency’s: severity 4/5 (Severe).

The hazard poses a serious risk of illness, injury, or structural failure. Stop using the product immediately and contact the manufacturer for a refund or repair.

Our severity reasoning: The recall involves a structural vehicle defect (driveshaft separation) that can cause a sudden loss of drive power, increasing the risk of a crash and potential injury, which aligns with the 'Severe' criteria for structural defects and significant injury reports.

Plain-English summary

Allison Transmission, Inc. (ATI) is recalling certain B3400xFE_R and B400R models with part numbers B3400xFE_R and B400R. The recall addresses a defect where the transmission yoke may separate, resulting in driveshaft separation and a sudden loss of drive power.

A sudden loss of drive power can increase the risk of a crash. Additionally, a disabled bus may require an evacuation procedure in an uncontrolled traffic situation, increasing the risk of injury to passengers.

Dealers will inspect the output yoke bolts and, if necessary, tighten loose output yoke bolts free of charge. Owner notification letters were mailed on December 9, 2023. Owners may contact ATI customer service at 1-317-242-5000 or the NHTSA Vehicle Safety Hotline at 1-888-327-4236.

The recalled product

Product
POWER TRAIN:DRIVELINE:DRIVESHAFT recall
Manufacturer
Allison Transmission, Inc.
Category
Vehicle — Commercial Bus Drivetrain
Hazard
Affected units
8,498

Distribution

Distributed nationwide across the United States.

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