Allison Transmission, INC B3400, B400 Series Transmission: Power train — driveshaft

Affects Allison Transmission, INC B3400, B400 Series Transmission · — — about 8K vehicles.

The hazard

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.

What to do

Dealers will inspect the output yoke bolts, and if necessary, tighten loose output yoke bolts, free of charge. Owner notification letters were mailed December 9, 2023. Owners may contact ATI customer service at 1-317-242-5000. ATI's number for this recall is 2023FA04.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational