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CLUTCH AND TRANSMISSIONS 7-34
3. Pressure regulator valve stuck.
4. Leak at valve body to case gasket.
5. Leak between valve body gaskets,.
6. Leak at servo center.
7. Front pump clearances.
• Drive Range Overrun (Coast) Pressure
With the vehicle coasting in "Drive" range at 20-25
MPH with engine vacuum at approximately 20" Hg., low
servo apply (main line) pressure sttould be as shown on
the pressure check chart.
POWERGLIDE BASIC PRESSURE (MAINLINE) CHECK CHART
Engine
L-4 - 153 and
L-6 - 194
L-6 - 230
L-6 - 250
(Pass.)
L-6 - 250
(Taxi & Police)
V-8 - 283
V-8-327(2BBL Camaro)
V-8 - 327 & 427
V-8 - 396
V-8-327(W/RPO K-19)
V-8 - 350
Wide Open
Throttle
Upshift (psi)
93 - 104
96 - 112
91 - 105
96 - 112
90 - 105
91 - 107
104 - 119
104 - 119
99 - 113
91 - 106
Idle Pressure In
"Drive" Range
16" Hg.
3 5 - 4 8
60 - 74
59 - 72
60 - 74
60 - 73
60 - 74
60 - 74
60 - 74
54 - 69
60 - 74
10" Hg.*
60 -
71
88 - 101
84 -
95
88 - 101
8 6 - 9 8
88 - 101
88 - 101
88 - 101
83 -
95
88 - 101
Manual "Low"
Range @ 1000
RPM (psi)
105 - 118
124 - 139
105 - 118
124 - 139
115 - 128
124 - 139
124 - 139
124 - 139
109 - 124
124 - 139
Drive Range
Overrun (Coast)
@ 20 - 25 MPH
(20" Hg.
Approx.) - psi
48 - 54
48 - 54
48 - 54
48 - 54
48 - 54
48 - 54
48 - 54
48 - 54
42 - 48
48 - 54
•Partially open throttle until vacuum reads 10" Hg.
CHEVROLET CHASSIS SERVICE MANUAL
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