[FONT="]Mfg Service Bulletin #: [/FONT] [FONT="]41[/FONT] [FONT="]NHTSA Item #: [/FONT] [FONT="]637387[/FONT][FONT="] Make: GM Model: SILVERADO/SIERRA 2500 Model Year: 2001-2002 Issue: SOME VEHICLES EQUIPPED WITH THE ALLISON LCT1000 TRANSMISSION MAY EXPERIENCE A VERY HARSH 2-1 DOWNSHIFT AT A STOP OR ON THROTTLE REAPPLY. [/FONT]