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TURBO HYDRA-MATIC 4 0 0 AUTOMATIC TRANSMISSION
7A4-11
2-3 SHIFT COMPLAINT
-
CHECK TRANS. OIL LEVEL
I
I
SOFT SHIFT. SLlFS. OR LONG DRAWN
GENERALLY AGGRESSIVE
OUT SHIFT WlTH END BUMP. ALSO. CAN
BE EARLY SHIFTS.
I
WlTH BRAKES APPLIED.
CHECK LlNE PRESSURE I N
CHECK LINE PRESSURE
DRIVE-BRAKES APPLIED.
I N DRIVE AT 1000 RPM
ENGINE AT 1000 RPM
NORMAL
I
'INSTALL
VACUUM GAUGE AS SHOWN
IN
SEE "CAUSES OF LOW
FIG. 6 ("T" FITTING A T MODULATOR).
LINE PRESSURE"
CHECK VACUUM AND PRESSURE RESPONSE TO
THROTTLE OPENING-BOTH SHOULD RESPOND
RAPIDLY TO OUICK CHANGES I N THROTTLE
OPENING.
VALVE ASSY. DRILLED
HOLE TO ACCUM.
PRESSURE AND VACUUM
VACUUM RESPONSE NORMAL.
RESPONSE POOR
PRESSURE RESPONSE POOR
AIR CHECK DIRECT CLUTCH FOR LEAK TO OUTER
CHECK FOR RESTRICTION
CHECK FOR COLLAPSED
AREA OF CLUTCH PISTON. LEAK COULD BE AT
I N VACUUM LINE AND
MODULATOR BELLOWS
CENTERPISTONSEAL-ZNDRINGDNCENTER
ISEE "INSPECTION OF
SUPPORT OR DAMAGED SUPPORT
REGULATOR AND VALVE'')
VACUUM PIPE
TO ENGINE
VALVE ASSY. FOR
DAMAGED OR
LEAKY PASSAGES
FOR DAMAGE. BLOCKED
DIR. CLUTCH FEED
ORIFICE OR MISPO-
SlTlONED GASKET.
-
1
3824
Diagnosis Chart C
MISSING FRONTSERVO
SPRING OR LEAK AT
SERVO PIN
INSPECT FOR
LEAK-CASE TO
CENTER SUPPORT.
BROKEN. UNDERSIZE
OIL RINGS DAMAGED.
REMOVE TRANS.
INSPECT DIR. CL. OR
PROPER NO & TYPE OF
CLUTCH
I
PLATES
I
-GOVERNOR ASSY
1
I
CLUTCH PLATEWI
I
ISEE GOVERNOR LlNE
r
-
~
~
~
~
~
~
VACUUM
PRESSURE CHECK"
1
(SEE "CAUSES OF
PROCEDURE)
IMPROPER VACUUM
AT MODULATOR'')
-CONTROL VALVE ASSY.-
STUCK 2-3 VALVE GASKETS
MlSPOSlTlONED OR LEAKING
I
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