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GROUP 21
TRANSMISSION
CONTENTS
Page
DESCRIPTION
.........................
1
SERVICE DIAGNOSIS
. . . . . . . . . . . . . . . . . . .
3
SERVICE PROCEDURE--SPEED
. . . . . . . . . .
3
SERVICE PROCEDURES4-SPEED
. . . . . . . . . .
19
SPEC IFlCATl ONS AND
TIGHTENING REFERENCE
. .
(In Rear of Manual)
PART I-MANUAL
TRANSMISSION
. . . . . . . .
1
Page
PART II-TORQUEFLITE
. . . . . . . . . . . . . . . . . .
30
DESCRIPTION
.........................
30
SERVICE DIAGNOSIS
. . . . . . . . . . . . . . . . . . .
3 0
SERVICE PROCEDURES
. . . . . . . . . . . . . . . . . .
49
TORQUE CONVERTER
. . . . . . . . . . . . . . . . . . .
75
SPECIFICATIONS AND
TIGHTENING REFERENCE
. .
(In Rear of Manual)
PART 1
M A N U A L TRANSMISSIONS
MODELS A-903 AND A-745
Description
The three speed manual transmissions are of the
synchromesh type with helical cut gears to provide
silent operation. The countershaft gear is in constant
mesh and is supported by roller bearings at each end.
The mainshaft is supported by ball bearings at each
end of the extension housing. The speedometer drive
gear is integral with the mainshaft.
The three speed Manual Transmission used on 6-
cylinder vehicles is referred to as Model A-903 (Fig.
l),
and the three speed Heavy Duty Manual Trans-
mission used on 8-cylinder vehicles is referred to as
Model A-745 (Fig. 2). The Model A-745 with modifica-
tions is also used on 6-cylinder Models for Taxi and
Police car operations.
The service procedures and illustrations for the
two transmissions are combined in this manual. Where
variations in procedures occur, the differences will be
identified as A-903 or A-745. When replacement of
parts is required, always refer to the Parts Catalog
to make sure the correct part is being installed.
MODEL A-833
Descripf ion
The A-833 four forward speed synchromesh trans-
mission, (Fig. 3), consists of a series of helical gears
designed for high torque capacity and with teeth so
proportioned as to operate at high speeds without ex-
cessive friction loss or heat generation. The shafts,
bearings, synchronizers and other precision parts are
held to close tolerances to provide durability during
extended heavy operation.
NK315
Fig. 1 -A0903
Three Speed Transmission
lSectional Viewl
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