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7A4-6
1 9 7 7 PONTIAC SERVICE M A N U A L
POSITIONS ONLY. WITH THE SELECTOR
LEVER IN THE "PARK"
POSITION, THE
PARKING PAWL SHOULD FREELY ENGAGE
AND
PREVENT
THE
VEHICLE
FROM
ROLLING.
ROAD TEST IF NECESSARY
Check All Shifts In The Following Manner:
a
DRIVE RANGE
Position selector lever in DRIVE RANGE and
accelerate the vehicle from 0 MPH. A 1-2 and 2-3 shift should
occur at all throttle openings [the shift points will vary with
the throttle opening]. As the vehicle decreases in speed to 0
MPH, the 3-2 and 2-1 shifts should occur.
SUPER RANGE
Position the selector lever in SUPER RANGE and
accelerate the vehicle from 0 MPH. A 1-2 shift should occur
at all throttle openings [no 2-3 shift can be obtained in this
range]. The 1-2 shift point will vary with throttle opening.
As the vehicle decreases in speed to 0 MPH, a 2- 1 shift should
occur.
NOTE: The 1-2 shift in SUPER RANGE is somewhat
firmer than in DRIVE RANGE. This is normal.
LO RANGE
Position the selector lever in LO RANGE and accelerate
the vehicle form 0 MPH. No upshift should occur in this
range, except possibly in some vehicles which have a high
numerical axle ratio and/or engine rpm.
2nd GEAR
-
OVERRUN BRAKING
Position the selector lever in DRIVE RANGE and, with
the vehicle speed at approximately 35 MPH with closed or
0 throttle, move the selector lever to SUPER RANGE. The
transmission should downshift to 2nd. An increase in engine
rprn and an engine braking effect should be noticed. Line
pressure should change from approximately 90 PSI to
approximately 150 PSI in 2nd gear.
1ST GEAR
-
OVERRUN BRAKING
Position the selector lever in SUPER RANGE at
approximately 30 to 40 MPH. With throttle closed, move the
selector lever to LO RANGE. A 2-1 downshift should occur
in the speed range of approximately 40 to 20 MPH, depending
on axle ratio and valve body calibration. The 2-1 downshift
at closed throttle will be accompanied by increased engine
rprn and an engine braking effect should be noticed. Line
pressure should be approximately 150 PSI. Stop vehicle.
REVERSE RANGE
Position the selector lever in REVERSE RANGE and
check for reverse operation.
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