RAM 2014 5500 Owner's Manual page 237

Recommended Vehicle Shift Speeds
To utilize your manual transmission efficiently for both
fuel economy and performance, it should be upshifted as
listed in recommended shift speed chart. Shift at the
Maximum Recommended Up-Shift Speeds
Gear Selection
Maximum
Speed (11 km/h)
1 to 2 2 to 3
7 mph 15 mph
(24 km/h)
vehicle speeds listed for acceleration. When heavily
loaded or pulling a trailer these recommended up-shift
speeds may not apply.
3 to 4 4 to 5
25 mph 40 mph
(40 km/h) (64 km/h)
STARTING AND OPERATING 235
5 to 6
45 mph
(72 km/h)
4