2003 FORD MUSTANG automatic transmission

DESCRIPTION AND OPERATION
Transmission Description
The 4R70W has the following features:
zWide ratio gears
z Four speeds
z Rear wheel drive
z Automatic
z Electronic shift
z Torque converter clutch control
z Line pressure controls
The transmission uses Ravigneaux- style double-pinion gearset with two bands, one one- way roller
clutch, one mechanical diode and four friction clutches to produce four forward gears and Reverse.
4R70W Automatic Transmission SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
12003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Identification Tags
All vehicles are equipped with a Vehicle Certification Label, located on the driver side door lock post.
For correct transmission identification, refer to the code in the space marked TR.
For model, service ID level or build date information, refer to the transmission service ID tag located on
the transmission case.
Identification Tag
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Item Part Number Description
1 — Model number
2 — Assembly number
3 — Serial number
4 — Model and serial number Klj . 1 ba
12003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Range Selection
The transmission has six range positions: P, R, N, (D), 2 and 1.
Park
In the PARK position:
zthere is no powerflow through the transmission.
z the parking pawl locks the output shaft to the case.
z the engine can be started.
z the ignition key can be removed.
Reverse
In the REVERSE position:
zthe vehicle can be operated in a rearward direction, at a reduced gear ratio.
z engine braking will occur.
Neutral
In the NEUTRAL position:
zthere is no powerflow through the transmission.
z the output shaft is not held and is free to turn.
z the engine can be started.
Overdrive
Overdrive is the normal position for most forward driving.
The OVERDRIVE position provides:
zAutomatic shifts.
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Shift Patterns
Upshifts
Transmission upshifting is controlled by the powertrain control module (PCM). The PCM receives
inputs from various engine or vehicle sensors and driver demands to control shift scheduling, shift feel
and torque converter clutch (TCC) operation.
Downshifts
Under certain conditions the transmission will downshift automatically to a lower gear range (without
moving the gearshift lever). There are three categories of automatic downshifts; Coastdown, Torque
Demand and Forced or Kickdown shifts.
Coastdown
The coastdown downshift occurs when the vehicle is coasting down to a stop.
Torque Demand
The torque demand downshift occurs (automatically) during part throttle acceleration when the
demand for torque is greater than the engine can provide at that gear ratio. If applied, the transmission
will disengage the TCC to provide added acceleration.
Kickdown
For maximum acceleration, the driver can force a downshift by pressing the accelerator pedal to the
floor. A forced downshift into a lower gear is possible below calibrated speeds. Specifications for
downshift speeds are subject to variations due to tire size, engine and transmission calibration
requirements.
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
12003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Disassembled Views
4R70W Automatic Transmission —
Disassembled View
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Bushings, Bearing and Thrust Washer Locator
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Item Part
Number Description
1 7D014 Pump No.1 thrust washer (select fit)
2 7A166 Forward clutch No. 2 bearing and race assembly
3 7F231 Forward clutch bearing and race assembly —
front
No. 3 4 7F244 Forward clutch hub bearing and race assembly No.
4
5 7F244 Forward clutch sun gear bearing and race
assembly No. 5
6 7F241 Planet assembly bearing and race No. 6
7 7F243,
7F237 Direct clutch inner bearing, race assembly No. 7
and direct clutch inner bearing support No. 7
8 7F240 Direct clutch outer bearing and race assembly No.
8
9 7F242 Outer bearing and race assembly —
rear No. 9 10 — Extension bushing (part of 7A039)
11 7025 Case bushing
12 7B233 Output shaft bushing
13 7B375 Planet carrier bushing —
rear 14 7F209 Forward clutch sun gear bushing
15 7N193 Reverse clutch sun gear bushing Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Seals, Rings and Gasket Locator
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Item Part Number Description
1 7A248 Front pump seal assembly
2 7A248 Front pump seal
3 7A136 Front pump gasket Klj . 1 ba
32003 Mustang Workshop Manual
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DESCRIPTION AND OPERATION
Main Components and Functions
Transmission Main Components —
Sectional View
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Item Part Number Description
1 7902 Torque converter
2 7B164 Intermediate clutch (friction)
3 7B164 Reverse clutch (friction)
4 7B164 Forward clutch (friction)
5 7B164 Direct clutch (friction)
6 7F207 Forward clutch cylinder and shaft
7 7F351 Shaft —
intermediate stub 8 7060 Output shaft
9 7A089 Planetary one-
way clutch 10 7D095 Reverse clutch band
11 7F196 Overdrive band
12 7A089 Intermediate one-
way clutch Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...