Workshop

HYDRA – MATIC 4L40 – E / 5L40 – E

- Manual Third can be used for conditions where it
is desirable to use only 3 gear ratios, such as trailer
towing or hilly terrain. This range also helps for
engine braking when descending grades. Upshifts
and downshifts all occur automatically, except 4th
and 5th is prohibited. Manual 3rd can be selected at
any vehicle speed but will downshift to 3rd only if
vehicle speed is low enough not to over-rev the
engine. Manual downshifts are controlled by the
TCM, not the manual valve.
The 5L40-E transmission is a completely new
design rear wheel drive unit and was designed to be a
four or five speed transmission. The same case and
components are used for both applications with the
exclusion of the 2nd clutch, 2nd coast clutch and the
2nd sprag clutch, and the use of a smaller ravigneaux
planetary carrier assembly in the 4 speed version.
The Hydra-matic 5L40-E is a fully automatic, five
forward speed, rear wheel drive, fully electronic
controlled transmission, with a maximum torque
rating of 360 Nm. It consists primarily of a four
element (Lock-Up) torque converter, one ravigneaux
planetary gear set, nine multiple-disc friction clutch
packs, four mechanical sprag clutches and a hydraulic
pressurization and control system. We have provided
you with an illustration to identify the location of the
nine different clutch packs, the four mechanical sprag
clutches and a component application chart in Figures
2 and 3.
The ravigneaux planetary gear set provides the five
forward speeds and reverse. Changing gear ratios is
fully automatic and is accomplished through the use
of a Transmission Control Module (TCM). The TCM
recieves and monitors various electronic sensor
inputs and uses this information to shift the
transmission at the optimum time, as illustrated in
Figure 8.
The TCM commands three on/off Shift Solenoids
to control shift timing. The TCM controls shift feel
through the Pressure Control Solenoid. The TCM
also controls the apply and release of the torque
converter clutch through a TCC/PWM Solenoid.
Refer to Figure 4 for the solenoid application chart for
each gear, along with case connector pin
identification and a resistance chart for the internal
components. Refer to Figure 5 for the internal wiring
schematic. Notice also in Figure 5 that this
transmission uses an Internal Mode Switch (IMS).
The IMS operation is illustrated and explained in
Figure 9, and description of each gear range is
explained in this section.
The hydraulic system primarily consists of a 13
vane pump, two control valve bodies, two channel
plates, converter housing and transmission case. The
pump maintains the working pressures needed to
stroke the clutch pistons that apply or release the
friction components.
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
14
GENERAL OPERATION AND DESCRIPTION
- Manual Fourth can be used for conditions where
it may be desirable to use only 4 gear ratios, such as
trailer towing or hilly terrain. This range is also
helpful for engine braking when descending slight
grades. Upshifts and downshifts all occur
automatically, except 5th gear is prohibited. Manual
Fourth can be selected at any vehicle speed but will
downshift into 4th gear only if vehicle speed is low
enough not to over-rev the engine. Manual
downshifts are controlled by the TCM, not the
manual valve location.
- Overdrive range should be used for all normal
driving conditions for maximum efficiency and fuel
economy. Overdrive range allows the transmission
to upshift automatically into each of the 5 forward
gear ratios. Downshifts to a lower gear are possible
for safe passing by depressing the accelerator, or by
manually selecting a lower gear with the shift
selector.
- Reverse position enables the vehicle to be
operated in a rearward direction.
- Park position enables the engine to be started
while preventing the vehicle from rolling either
forward or backward. Park position should not be
selected until the vehicle has come to a complete
stop. For safety reasons, the vehicles parking brake
should always be used in addition to the "Park"
position.
- Neutral position enables the engine to start and
operate without driving the vehicle. If necessary,
this position should be selected to restart the engine
while the vehicle is moving.
P
R
N
4
3
D
With the "Standard" range indicator, as illustrated in
Figure 12, the transmission may be operated in any
one of the seven different positions shown on the
shift quadrant as follows;
STANDARD SHIFT QUADRANT

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