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# 150900.
THIS MESSAGE CONCERNS VEHICLES EXHIBITING A CLUNK NOISE COMING FROM THE FRONT OF THE VEHICLE. CUSTOMERS MAY STATE THAT A CLUNK NOISE IS HEARD WHEN TURNING THE STEERING WHEEL. *TT