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2 1-30
TRANSMISSION-TORQUEFLITE
DIAGNOSIS
PART II
TORQUEFLITE TRANSMISSION (TORQUE CONVERTER)
IA-904-Gf A-904-LAf A-727-A AND B)
Description
Three different TorqueFlite Transmissions are used
in the Plymouth Vehicles (Figs. 1 and
2).
Their usage
is determined by the type of engine with which it is
installed. Identification markings shown in the fol-
lowing application chart are cast in raised letters
about
3/s
inch high on the lower left side of the bell
housing.
TRANSMISSION APPLICATION CHART
Engine
Displacement
identification
Type
Cubic Inch
Marking
6
Cyl.
170-225
A-904-G
8
Cyl.
273
A-904-LA
8
Cyl.
31 8
A-727-A
8
Cyl.
361 -383-426
A-727-0
The A-727-A, mounted with an adapter plate be-
tween the transmission and engine, is available for
heavy duty police and taxi service with the
6
Cyl.,
225
Cu. In. engine.
Because of the similarity in design and in servicing
the three transmissions, the procedures have been
combined in this Manual. Where variations in proce-
dures occur, application to the A-904-G, A-904-LA
or
A-727-A and B is indicated.
CAUTION: Transmission operation requirements
are different for some vehicles due to high per-
formance engines or special equipment applica-
tions. Therefore, some internal part will be differ-
ent from standard to provide the desired transmis-
sion operation. These "special" parts are listed in
applicable Parts Catalog; therefore, be sure they are
used when replacement is necessary.
The transmission combines a torque converter with
a fully-automatic 3-speed gear system (Figs. 1 and 2).
The torque converter housing and transmission case
are an integral aluminum casting. The transmis-
sion consists of two multiple disc clutches, an over-
running clutch, two servos and bands, and two plane-
tary gear sets to provide three forward ratios and a
reverse ratio. The common sun gear of the planetary
gear sets is connected to the front clutch by a driving
shell which is splined
to
the'sun gear and to the front
clutch retainer. The hydraulic system consists of a
front and rear pump, and a single valve body which
contains all of the valves except the governor valve.
Venting of the transmission is accomplished by a
drilled passage through the upper part of the front oil
pump housing.
The torque converter is attached to the crankshaft
through a flexible driving plate. Cooling of the con-
verter is accomplished by circulating the transmis-
sion fluid through an oil-to-water type cooler, located
in the radiator lower tank. The torque converter as-
sembly is a sealed unit which cannot be disas-
sembled.
The transmission fluid is filtered by an internal
"Dacron Type" filter attached to the lower side of the
valve body assembly.
Engine torque is transmitted to the torque con-
verter then, through the input shaft to the multiple
disc clutches in the transmission. The power flow
depends on the application of the clutches and bands.
Refer to "Clutch Engagement and Band Application
Chart.
SERVICE DIAGNOSIS
TORQUEFLITE TRANSMISSION
NOTE: The transmission should not be removed nor disassembled until a careful diagnosis is made,
the definite cause determined and all possible external corrections performed. in diagnosing any ab-
normal shift condition, always make the hydraulic pressures test before disassembly or replacement
of parts.
Condition
Possible Cause
Correction
HARSH ENGAGEMENT
IN D, 1,
2 AND R
(a) Engine idle speed too high.
(b) Hydraulic pressures too high or low.
(a) Adjust the engine idle speed to 500 rpm. Read-
(b) Check fluid level, then perform hydraulic pres-
just throttle linkage.
sure tests and adjust to specifications.
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