2011 Ford F450 Super Duty Crew Cab Owner Guide 4th Printing - Page 290

Driving All available gears will be displayed with the current gear indicated. Press the - button again to lock out gears beginning with the highest gear. Example: press the - button twice to lock out 6th and 5th gears. Only the available gears will be displayed and the transmission will automatically shift between the available gears. Press the + button to unlock gears. By moving the gearshift lever from the D (Drive) position to the M (Manual) position you may now manually select the gear you desire. Only the current gear will be displayed. Press the + button or the - button to upshift or downshift. If the - button is pressed at a vehicle speed that would cause an engine overspeed, the requested gear will flash then disappear and the transmission will remain in the current gear. Recommended shift speeds Upshift according to the following chart: Upshifts when accelerating (recommended for best fuel economy) Shift from: Gasoline engines Diesel engines 1-2 15 mph (24 km/h) 12 mph (19 km/h) 2-3 25 mph (40 km/h) 19 mph (31 km/h) 3-4 40 mph (64 km/h) 26 mph (42 km/h) 4-5 45 mph (72 km/h) 34 mph (55 km/h) 5-6 50 mph (80 km/h) 46 mph (74 km/h) In order to prevent the engine from running at too low an RPM, which may cause it to stall, the SST will still automatically make some downshifts if it has determined that you have not downshifted in time. Although the SST will make some downshifts for you, it will still allow you to downshift at any time as long as the SST determines that the engine will not be damaged from over-revving. The SST will not automatically upshift, even if the engine is approaching the RPM limit. It must be shifted manually by pressing the + button. Engine damage may occur if excessive engine revving is held without shifting. 290 2011 F-250/350/450/550 (f23) Owners Guide, 4th Printing USA (fus)