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these conditions, using the ⬙3⬙ range will improve perfor-
mance and extend transmission life by reducing exces-
sive shifting and heat buildup.
If the transmission temperature exceeds normal operat-
ing limits, the powertrain controller will modify the
DRIVE and “3” range shift points. This is done to prevent
transmission damage due to overheating.
During cold temperatures, transmission operation may
be modified depending on engine and transmission
temperature as well as vehicle speed. This feature im-
proves warm up time of the engine and transmission to
achieve maximum efficiency. Engagement of the torque
converter clutch is inhibited until the transmission fluid
is warm (refer to the “Note” under “Torque Converter
Clutch” in this section). During extremely cold tempera-
tures (-16°F [-27°C] or below), operation may briefly be
limited to second gear only. Normal operation will re-
sume once the transmission temperature has risen to a
suitable level.
DRIVE 3
This range eliminates shifts into fourth gear. The trans-
mission will operate normally in first and second gear.
Shifts into third may be delayed to provide second gear
operation at higher speeds. Using the ⬙3⬙ range while
operating the vehicle under heavy operating conditions
will improve performance and extend transmission life
by reducing excessive shifting and heat build-up. The ⬙3⬙
range should also be used when descending steep grades
to avoid brake system distress.
LOW
Use this range for engine braking when descending very
steep grades. In this range, the transmission will down-
shift for maximum engine braking, and upshifts will
occur only to prevent engine overspeed.
5
STARTING AND OPERATING 307
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