4L80E / 4L85E TRANSMISSION MAY HAVE A CONDITION IN WHICH THE TRANSMISSION OVERDRIVE GEAR SET MAY FAIL DUE TO INADEQUATE LUBRICATION AS A RESULT OF A TRANSMISSION CASTING CHANGE. CUSTOMER SATISFACTION PROGRAM BULLETIN. ALSO TO INCLUDE 2004 CHEVROLET AND GMC W3500, W4500, AND ISUZU NPR, NPR-HD. *TT