Road Test; Shift Point Information - Pontiac Grand Prix Service Manual

TURBO HYDRA-MATIC TRANSMISSION M-38
7G-49
Fig.
76-127
Side View o f Transmission
safety standpoint. The neutralizer switch should be
(Fig. 7G-127). Observe and record results of pressure
adjusted so that engine will start in the PARK and
checks, comparing results with transmission pressures
NEUTRAL vositions only. shown under TRANSMISSION OIL PRESSURE
CHECKS below.
With the selector lever in PARK range, the parking
pawl should freely engage and
re vent
vehicle from Check all the shifts in the following manner:
rolling. The pointer on the indicator quadrant should
line up properly with the range indicators in all ranges.
ROAD TEST
DRIVE Range:
Position selector lever in DRIVE ranee, accelerating
When road testing vehicle, a reliable pressure gage
vehicle from
0
mph. A 1-2 and 2-3 shlft should occur
should be attached to the line pressure port on the at all throttle openings, shift points varying with the
right side of the transmission case, behind and throttle opening. As vehicle speed decreases to 0 mph,
adjacent to the intermediate clutch accumulator cover
a 3-2 and 2-1 shift should occur (Fig. 76-128).
Fig. 76.128 Shift Point Information
The following shift points are APPROXIMATE and should
be
obtained as follows, providing
Engine Tune-up
is satisfactory:
SELECTOR LEVER IN-
DRIVE
Full
Throttle
Part Throttle
Minimum Throttle
Coasting
SUPER
LOW
UPSHIFTS (MPH)
Engine Braking
@
ANY SPEED
Engine Braking @ 46 MPH OR BELOW
1-2
50
12-50
12
-
DOWNSHIFTS (MPH)
2-3
85
22-85
22
-
3-2
75
50
-
22
3 OR 2-1
40
-
-
9