SI B27 02 13February 2015 Intermediate and Special Transmission Technical Service This Service Information bulletin supersedes SI B27 02 13 dated June 2013. designates changes to this revision SUBJECT Knocking Noise from Driveline During Low-speed Turning. A cracking or knocking noise is heard from the driveline on sharp turns at low driving speeds (<15 mph). CAUSE Software calibration error in the transfer case control unit (Longitudinal Torque Module or LMV)