FORD 2010 F-550 v.2 - Manual (Page 279)

the redline area. Operating the engine beyond the recommended speeds
can cause severe engine damage.
Shift according to the following shift speed charts:
Upshifts when accelerating (recommended for best fuel
economy)
6-speed transmission
Shift from: Transfer case position 1 (if equipped)
2H or 4H 4L
LO-1 5 mph (8 km/h) 2 mph (3 km/h)
1-2 14 mph (23 km/h) 6 mph (10 km/h)
2-3 22 mph (35 km/h) 9 mph (14 km/h)
3-4 30 mph (48 km/h) 12 mph (19 km/h)
4 - D (Overdrive) 40 mph (64 km/h) 15 mph (24 km/h)
Maximum downshift speeds 1
6-speed transmission
Shift from: Transfer case position (if equipped) 2
2H or 4H 4L
D (Overdrive) - 4 45 mph (72 km/h) 16 mph (26 km/h)
4-3 35 mph (56 km/h) 12 mph (19 km/h)
3-2 20 mph (32 km/h) 8 mph (13 km/h)
2-1 5 mph (8 km/h) 2 mph (3 km/h)
1-LO Only shift to LO when at a stop.
1 Use 2H or 4H for 4WD equipped vehicles.
2 Downshift at lower speeds when driving on slippery surfaces.
Reverse
1. Make sure that your vehicle is at a complete stop before you shift into
R (Reverse). Failure to do so may damage the transmission.
2. Move the gearshift lever into the neutral position and wait at least
three seconds before shifting into R (Reverse).
Note: The gearshift lever can only be moved into R (Reverse) by moving
it from left of 3 (Third) and 4 (Fourth) before shifting into R (Reverse).
This is a lockout feature that protects the transmission from accidentally
being shifted into R (Reverse) from D (Overdrive).
Driving
279
2010 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)