2011 Chevrolet Silverado 1500 Regular Cab Owner's Manual - Page 332

9-48 Driving and Operating condition. If vehicle speed is above the desired speed the transmission will downshift to slow the vehicle. If vehicle speed is near or below desired speed the trans will upshift, allowing vehicle speed to increase. While in the Range Selection Mode, Cruise Grade Braking is not available. This feature is active when the exhaust brake is enabled (if equipped). See "Range Selection Mode" under Manual Mode on page 9‑45. Cruise Grade Braking (Allison Transmission or Hydra-Matic 6-Speed Automatic Transmission) Cruise Grade Braking assists when driving on a downhill grade. It maintains vehicle speed by automatically implementing a shift schedule that uses the engine and the transmission to slow the vehicle. Cruise Grade Braking operates while Cruise Control is engaged in Tow/Haul Mode to assist in maintaining vehicle speed under loaded vehicle conditions. It utilizes vehicle acceleration and deviation from desired speed to determine the correct gear for the operating Manual Transmission If the vehicle is equipped with a manual transmission, this is the shift pattern. Here is how to operate the manual transmission: 1 (First): Press the clutch pedal and shift into 1 (First). Then, slowly let up on the clutch pedal as you slowly press down on the accelerator pedal.