Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Chevrolet for this TSB. Call your local Chevrolet dealer's service department & ask for a copy of TSB# 181000.
Affected Component: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)
ENGINEERING IS INVESTIGATING HARSH ONE-TWO SHIFT ON THE 4L60E AUTOMATIC TRANSMISSION. THIS INVESTIGATION IS FOCUSED ON HARSH ONE-TWO SHIFTS ON 2000 MODEL YEAR SILVERADO AND SIERRA EQUIPPED WITH 4L60E AUTOMATIC TRANSMISSION. *TT