FORD 1999 F-150 - Manual (Page 125)

Recommended shift speeds
Upshift and downshift according to the following charts for your specific
engine/drivetrain combination:
Upshifts when accelerating
(recommended for best fuel economy)
Shift from: Transfer case position 1 (if equipped)
2H or 4H 4L
1 - 2 14 km/h (9 mph) 5 km/h (3 mph)
2 - 3 32 km/h (20 mph) 11 km/h (7 mph)
3 - 4 50 km/h (31 mph) 19 km/h (12 mph)
4 - D (Overdrive) 71 km/h (44 mph) 27 km/h (17 mph)
Upshifts when cruising (recommended for best fuel economy)
Shift from: Transfer case position 1 (if equipped)
2H or 4H 4L
1 - 2 16 km/h (10 mph) 6 km/h (4 mph)
2 - 3 26 km/h (16 mph) 10 km/h (6 mph)
3 - 4 43 km/h (27 mph) 16 km/h (10 mph)
4 - D (Overdrive) 68 km/h (42 mph) 26 km/h (16 mph)
Maximum downshift speeds 2
Shift from: Transfer case position (if equipped) 1
2H or 4H 4L
D (Overdrive) - 4 88 km/h (55 mph) 34 km/h (21 mph)
4 - 3 72 km/h (45 mph) 27 km/h (17 mph)
3 - 2 56 km/h (35 mph) 21 km/h (13 mph)
2 - 1 32 km/h (20 mph) 11 km/h (7 mph)
1 Use 2H or 4H for 4WD equipped vehicles. 2 Downshift at lower speeds
when driving on slippery surfaces.
Driving
125