Dodge 2008 Ram 2500 PowerWagon - Manual (Page 140)

Tapping the DECEL button once will result in a speed
decrease (refer to the table below for the speed for your
specific engine). Each time the button is tapped, speed
will decrease. For example, tapping the button 3 times
will decrease the speed by 3 times the speed listed in the
table below (refer to the table below for the speed for
your specific engine). To decrease speed while the speed control is on, press
and hold the DECEL button. Release the button when the
desired speed is reached, and the new speed will be set.
Functions 5.7L Engine
Engage Speed 25 mph (40 km/h)
Minimun RESUME Speed 20 mph (32 km/h)
ACCEL Increase 1 mph (2 km/h)
DECEL Decrease 1 mph (2 km/h)
Dropout Speed 20 mph (32 km/h)
140 UNDERSTANDING THE FEATURES OF YOUR VEHICLE