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(4) Position grille panel on grille face panel and
install grille panel attaching screws.
(5) Check and correct transmission fluid level.
RADIATOR
COOLER LINE
FITTING
COOLER LINE
(TO RADIATOR
TRANSMISSION
AUXILIARY
COOLER
COOLER LINE
TO TRANSMISSION]
Fig. 2C-6 Auxiliary Cooler Assembly
TRANSMISSION COMPONENTS
81009
Clutch-Band-Gear System
Transmission models 999 and 727 each have two mul
tiple disc clutches, two bands and actuating servos, an
overrunning clutch and two planetary gear sets, all of
which combine to provide one reverse and three forward
gear ranges. The planetary gear sets are connected by a
common sun gear. The sun gear is interconnected to the
multiple disc clutches through the driving shell which is
splined to the sun gear and front clutch retainer.
The model 999 transmission has a wide ratio plan
etary gear set. Ratios are:
• 1st Gear
2.74:1
• 2nd Gear
1.55:1
• 3rd Gear
1.00:1
• Reverse
2.20:1
Hydraulic System
The hydraulic system consists of a single oil pump, a
valve body containing the pressure regulating shift con
trol, and lockup control valves, a governor valve assem
bly, two band actuating servos and an accumulator.
Fluid Cooling and Filtration
The transmission fluid is cooled by circulating the
AUTOMATIC TRANSMISSION
2C-5
fluid through an external cooler built into the radiator
lower tank.
Transmission fluid is filtered by a Dacron element
filter attached to the valve body. The filter is a ser
viceable component and can be replaced whenever diag
nosis or service requirements indicate the need.
Transmission Venting
The transmission is vented through a passage drilled
into the upper portion of the oil pump housing.
IDENTIFICATION
The model 999 transmission has a double wrap rear
band and external characteristics that will readily iden
tify it. The 999 model has reinforcing ribs cast into the
top of the rear servo boss on the case.
The 727 model is physically larger, being designed for
use with eight-cylinder engines or for heavy-duty appli
cations. Major internal differences between the 727 and
999 models are in the rear clutch, valve body, kickdown
servo, planetary gear assemblies and end play adjust
ments. The 727 has an external characteristic that dis
tinguishes it from 999 models: the slope of the converter
housing is much more gradual.
Lockup Torque Converter Identification
Because the lockup mechanism is completely enclosed
within the converter and not visible, lockup converters
have an identifying decal attacched to the front cover.
The decal is circular in shape and states converter
type and stall ratio such as, Lockup and LS (lowstall) or
HS (high stall).
Transmission Code and Part Numbers
A seven-digit transmission part number is stamped
on the left side of the case just above the oil pan mating
surface (fig. 2C-7). This number is followed by a four-
[
PART NUMBER
CALENDAR §* SERIAL NUMBER
Fig. 2C-7 Transmission Code and Part Numbers
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Troubleshooting
