NOTE: Transmission fluid level must be set correctly for highest
retarder effectiveness. As much as 2 liters (2 quarts) too high or too low
can reduce retarder effectiveness and increase transmission temperature.
RANGE PRESELECTION
NOTE: Preselecting during normal operation may result in reduced fuel
economy.
Range preselection means selecting a lower range to match driving conditions
encountered or expect to be encountered. Learning to take advantage of
preselected shifts will give you better control on slick or icy roads and on
downgrades.
Downshifting to a lower range increases engine braking. The selection of a lower
range often prevents cycling between that range and the next higher range on a
series of short up-and-down hills.
COLD WEATHER STARTS
All Emergency Vehicle Series transmissions are programmed to restrict full
operation until specific fluid temperatures are reached. Refer to the following table
for temperature restrictions.
Minimum Fluid Operating Temperatures
Sump Fluid Temperature
CHECK
TRANS Light Operation
–32°C (–25°F) to –7°C (19°F) OFF Neutral, Reverse, Second
–7°C (19°F) OFF Full operation in all ranges
NOTE: When sump temperature is below 10°C (50°F) and transmission
fluidisC4(not DEXRON
®
or TranSynd™), follow these procedures
when making directional shift changes:
• To shift from forward to reverse, select N (Neutral) and then
R (Reverse).
• To shift from reverse to forward, select N (Neutral) and then
D (Drive) or other forward range.
Failure to follow these procedures may cause illumination of the
CHECK TRANS light and the transmission will be restricted to
N (Neutral).
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