Dodge 2006 Caravan Owner's Manual page 312

312 STARTING AND OPERATING
"R" Reverse
Shift into this range only after the vehicle has come to a
complete stop.
"N" Neutral
Engine may be started in this range.
"D" Overdrive
For most city and highway driving, it provides smoothest
upshifts and downshifts and best fuel economy. When
frequent transmission shifting occurs while using the
"D" Overdrive position, such as when operating the
vehicle under heavy loading conditions, (i.e. in hilly
terrain, traveling into strong head winds or while towing
heavy trailers), using the "3" position will improve
performance and extend transmission life by reducing
excessive shifting and heat build-up.
"3" Drive
This range eliminates shifts into Overdrive. The transmis-
sion will operate normally in First, Second and Third
while in this range. The "3" position should also be used
when descending steep grades to prevent brake system
distress.
NOTE: Using the "3" range while operating the vehicle
under heavy operating conditions will improve perfor-
mance and extend transmission life by reducing exces-
sive shifting and heat build up.
"L" Low
This range should be used for engine braking when
descending very steep grades. In this range, upshifts will
occur only to prevent engine overspeed while downshifts
occur earlier than other gear range selections.
NOTE: The vehicle computer will over ride Overdrive
and "3" Drive ranges by changing shift points if the
transmission operating temperature exceeds acceptable
limits. This is done to prevent transmission damage due
to overheating.