Pontiac FIREBIRD 1972 Service Manual page 893

T U R B O HYDRA-MATIC (M-40) TRANSMISSION 7E-3
I
Super Range Minimum Maximum
2nd Gear
-
Steady road load a t approximately
25
mph
145
psi
155
psi
I
Gear
Selector Lever Position Minimum Maximum
Drive (Zero to f u l l throttle)
. .
.
.
. . .
.
.
.
6 0
150
I
3rd Drive (Zero Throttle at
30
mph)
.
.
. . . . . .
6 0
I
Reverse Reverse (Zero to f u l l throttle).
. . .
.
. . . . .
9 5 260
Fig. 7 E - 1 Oil Pressure Check
-
Road or Normal Operating Conditions
1ST GEAR
-
OVERRUN BRAKING:
With the selector lever in Super at approximately 30 mph
at constant 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.
OIL PRESSURE CHECKS
ROAD OR NORMAL OPERATING CONDITIONS
While road testing with the transmission oil pressure
gauge attached and the vacuum modulator tube con-
nected, the transmission pressures should check approxi-
mately as shown in Fig. 7E-1.
VEHICLE STATIONARY AND ENGINE AT 1200
RPM
With the transmission oil pressure gauge attached and the
vacuum modulator tube disconnected, the transmission
pressures should check approximately as shown in Fig.
7E-2.
VEHICLE STATIONARY AND ENGINE AT 1000
RPM
With the transmission oil pressure gauge attached and the
vacuum modulator tube connected for normal modulator
operation, the transmission pressure should check approx-
imately as shown in Fig. 7E-3.
NOTE: Pressures are not significantly affected
by altitude or barometric pressure when the
vacuum modulator tube is connected.
CONTROL VALVE ASSEMBLY
-
GOVERNOR LINE
PRESSURE CHECK
1. With car on hoist (rear wheels off ground), discon-
nect the vacuum line to the vacuum modulator, in-
stall a line pressure gauge to the transmission and a
tachometer to the engine.
2. Start engine, keep foot off brake, move selector lever
to Drive range and check line pressure with engine
speed at 1,000 rpm's.
3. Slowly increase engine rpm to 3,000 rpm and deter-
mine if a line pressure drop occurs (7psi o r more).
Approximate Altitude
(Ft. above sea level)
0
Fig. 7E-2 Oil Pressure Check
-
Vehicle Stationary, Vacuum Tube Disconnected