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# PI1309.
THIS PRELIMINARY BULLETIN PROVIDES A PROCEDURE TO REPROGRAM THE CONTROL SOLENOID VALVE AND THE TCM TO CORRECT THE CUSTOMERS CONCERN OF HARSH ENGAGEMENT AND/OR LOW SPEED SHUDDER.