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Torque Converter Clutch
A feature designed to improve fuel economy is included
in all automatic transmissions. A clutch within the torque
converter engages automatically at a calibrated speed at
light throttle. It engages at higher speeds under heavier
acceleration. This may result in a slightly different feeling
or response during normal operation in high gear. When
the vehicle speed drops below a calibrated speed, or
during acceleration, the clutch automatically and
smoothly disengages. The feature is operational in
OVERDRIVE and in DRIVE.
NOTE: The torque converter clutch will not engage
until the transmission fluid and engine coolant are warm
(usually after 1-3 mi [1.6 - 4.8 km] of driving). Because the
engine speed is higher when the torque converter clutch
is not engaged, it may seem as if the transmission is not
shifting into Overdrive when cold. This is normal. Press-
ing the TOW/HAUL button, when the transmission is
sufficiently warm, will demonstrate that the transmission
is able to shift into, and out of, Overdrive. For vehicles
with 4.7L or 5.7L engines (which have two Overdrive
gears), the transmission may not shift into 5th gear until
the transmission fluid and engine coolant are warm.
NOTE: If the vehicle has not been driven in several
days, the first few seconds of operation after shifting the
transmission into gear may seem sluggish. This is due to
the fluid partially draining from the torque converter into
the transmission. This condition is normal and will not
cause damage to the transmission. The torque converter
will refill within five seconds of shifting from PARK into
any other gear position.
STARTING AND OPERATING 279
5
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