Installation Of Transmission Assembly; Manual Linkage; Shift Pattern Check; Turbo Hydra-Matic Transmission Oil P R E S S U R E Checks - Pontiac Grand Prix Service Manual

TURBO HYDRA-MATIC-M-40
73-59
Fig 7E-181 Installing
Speedometer Drive Gear and
Sleeve
INSTALLATION OF TRANSMISSION
ASSEMBLY
Reverse the procedure for transmission removal as
stated on page 7E-12.
MANUAL LINKAGE
Manual linkage adjustment and the associated neutral
safety switch are important from a safety stand point.
The neutral safety switch should be adjusted so that
the engine will start in the Park and Neutral positions
only.
With the selector lever in the Park position, the
parking pawl should freely engage and prevent the
vehicle from rolling. The pointer on the indicator
quadrant should line up properly with the range
indicators in all ranges.
ROAD TEST (ATTACH PRESSURE GAUGE TO
TRANSMISSION)
The car owner should accompany the tester and the
complaint analyzed under the same or simulated
conditions.
SHIFT PATTERN CHECK
Check all the shifts in the following manner:
Drive Range:
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,
h
2-1 shift should occur.
Lo Range:
Position the selector lever in Lo Range. No upshift
should occur in this range, regardless of throttle
opening.
2nd Gear Overrun Braking:
Position the selector lever in the drive Range and, with
the car speed at approximately 35 mph, 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 60 psi to approximately 150 psi in
2nd.
o
I st Gear
-
Downhill or Overrun Braking:
With the selector lever in Super at approximately 30
mph at constand throttle, reposition the selector lever
into Lo Range. An increase in engine rpm and a
braking effect should be noticed. Line pressure should
be approximately 150 psi (Figs. 180 and 18 1).
TURBO HYDRA-MATIC TRANSMISSION-OIL
PRESSURE CHECKS
1. Oil Pressure Check
-
Road or Normal Operating
Conditions
While road testing with the transmission oil pressure
gage attached and the vacuum modulator tube
connected, the transmission pressures should check
approximately as shown in Fig. 7E- 182.
2. Oil Pressure Check
-
With Car Stationary and Engine
at 1200 rpm
With the transmission oil pressure gage attached and
the vacuum modulator tube disconnected
,
the trans-
mission pressures should check approximately as
shown in Fig. 7E-183.
3. Oil Pressure Check
-
With Car Stationary and Engine
at 1000 rpm
Position selector lever in Drive Range, accelerating the
With the transmission oil pressure gage attached and