The recall affects Transit vehicles with medium, long and extended wheelbases and chassis cab or cutaways with medium wheelbases. If these vans are driven with a cracked flexible coupling, the driveshaft might separate. This could result in a loss of motive power while driving or unintended vehicle movement in park when the parking brake isn’t applied. separation of the driveshaft from the transmission might cause secondary damage to surrounding components, including brake and fuel lines. A driveshaft separation poses a safety risk, potentially raising the chances of a crash.