Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
951918
SOME VEHICLES MAY HAVE A DRIVESHAFT IMBALANCE WHEN OPERATED AT HIGH ROAD SPEEDS. THIS IMBALANCE CAN RESULT IN A CRACK IN THE TORQUE CONVERTER HOUSING OF THE TRANSMISSION AND/OR DRIVESHAFT TWISTING. THE DRIVESHAFT IMBALANCE OCCURS WHEN TRANSMISSION TORQUING FORCES BEND THE SHAFT WHEN IN OVERDRIVE RPM. THE DRIVESHAFT BENDING CAN BE CORRECTED BY REPLACING THE EXITING DRIVESHAFT WITH A SHORTER SHAFT.
951518
DRIVELINE-ALLISON MD-SERIES TRANSMISSION-IMBALANCE AT HIGH ROAD SPEEDS-150 INCH WHEELBASE-VEHICLES BUILT BEFORE 1/1/94. DRIVESHAFT-ALLISON MD-SERIES TRANSMISSION-IMBALANCE AT HIGH ROAD SPEEDS-150 INCH WHEELBASE-VEHICLES BUILT BEFORE 1/1/94.*SD
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.