2000 SilveradoMay 22, 2015Why do I have excessive RPMs while driving, but the transmission is shifting normally? Keywords:silverado 1 thought on “2000 Silverado” Freeautomechanic May 25, 2015 at 11:38 am Did you change the tire size or gearing? Do you have a tow package with a O/D off button? Are you sure you have it in top gear and not in 3rd? Comments are closed.