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7A1-2
1977 PONTIAC SERVICE MANUAL
merely acting as a fluid coupling as both the converter pump
and turbine are being driven at approximately the same speed,
or at one-to-one ratio.
A hydraulic system pressurized by a gear type pump
provides the working pressure required to operate the friction
elements and automatic controls.
The selector quadrant has six selector positions: P, R,
N, D, L2(S) and Ll(L).
P-PARK position positively locks the output shaft to the
transmission case by means of a locking pawl to prevent the
vehicle from rolling in either direction. The engine may be
started in Park position.
R-REVERSE enables the car to be operated in a reverse
direction.
N-N EUTRAL position enables the engine to be started
and run without driving the vehicle.
D-DRIVE range is used for all normal driving
conditions and maximum economy. Drive range has three
gear ratios, from the starting ratio to direct drive. Detent
downshifts are available by depressing the accelerator to the
floor.
S-SUPER
(or
L2) range has the same starting ratio as
Drive Range, but prevents the transmission from shifting
above second gear, thus retaining second gear for acceleration
or engine braking as desired. L2 or S Range can be selected
at any car speed, and the transmission will shift to second gear
and remain in second until the car speed or the throttle are
changed to obtain first gear operation in the same manner as
in D Range.
L-LOW
(or
L l ) range can be selected at any car speed,
and the transmission will shift to second gear and remain in
second until the car is reduced to approximately 48 km/h (30
MPH) at which time the transmission will shift to first gear.
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