FORD MUSTANG 2003 Workshop Manual

Item Specification
mm inch
Green thickness 1.217-
1.371 0.050-0.054
Yellow thickness 1.727-
1.828 0.068-0.072
Natural thickness 2.159-
2.260 0.085-0.089
Red thickness 2.590-
2.692 0.102-0.106
Blue thickness 3.022-
3.124 0.119-0.123
Forward Clutch Pack Item Specification
mm inch
Clearance 1.17-1.63 0.046-0.068
Snap ring thickness 1.524-
1.625 0.060-
0.064 1.880-
1.981 0.074-
0.078 2.235-
2.337 0.088-
0.092 2.591-
2.692 0.102-
0.106
Reverse Clutch Pack Item Specification
mm inch
Clearance 1.27-
1.94 mm (0.050-0.076 in)
Snap ring thickness 1.524-
1.625 0.060-0.064
1.880-1.981 0.074-0.078
2.235-2.337 0.088-0.092
2.591-2.692 0.102-0.106
Direct Clutch Pack Item Specification
mm inch
Clearance 1.5748-21.59 0.062-0.85
Snap ring thickness 1.270-
1.372 0.050-0.054
1.625-1.727 0.064-0.068
1.98,1-2.083 0.078-0.082
2.337-2.438 0.092-0.096
Intermediate Clutch Pack Item Specification
mm inch Klj . 4 ba
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Clearance 41.7322-42.5958 1.643-1.677
Selective steel plate 1.702-
1.803 0.067-0.071
1.956-
2.057 0.077-0.081
2.210-
2.311 0.087-0.091
2.464-
2.565 0.097-0.101
Torque Specifications Description Nm lb-
ft lb-
in Rear transmission support crossmember bolts 55 40 —
Rear insulator bolts 80 59 —
Extension housing bolts 28 21 —
Transmission fluid pan bolts 14 10 —
Front pump bolts 27 20 —
Front pump support bolts 23 17 —
Harness electrical connector bolt 5 — 44
Inspection cover bolts 35 26 —
Main control valve body bolts 10 — 89
Main control valve body cover plate bolts 10 — 89
Main control valve body separator plate bolts 10 — 89
Manual lever shaft nut 33 24 —
Manual lever shaft outer nut 33 24 —
Fluid cooler line case fittings 21 15 —
Pressure tap plugs 12 9 —
Rear driveshaft bolts 112 83 —
Starter bolts 25 18 —
TCC solenoid bolt 10 — 89
Torque converter drain plug 12 9 —
Torque converter nuts 37 27 —
Digital transmission range (TR) sensor bolts 9 — 80
Transmission bell housing bolts 47 35 —
Vehicle speed sensor (VSS) plug bolt 9 — 80
Output shaft speed (OSS) sensor bolt 12 9 —
Starter B+ cable 11 8 —
Exhaust manifold bolts 40 30 —
Exhaust pipe bolts 40 30 —
Transmission vent tube 12 9 —
Manual control valve detent lever spring bolt 10 — 89
Cooler tube nut to case fitting 18 13 —
Rear differential retaining nuts (front) 90 66 —
Rear differential retaining bolts and nuts (rear) 70 52 — Klj . 5 ba
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Transmission linkage 23 17 —
Shift cable bracket 14 10 —
Transmission test plate bolts 10 — 89 Klj . 6 ba
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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
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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
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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
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z
Apply and release of the torque converter clutch.
z Maximum fuel economy during normal operation.
Second Position
This position provides:
zSecond gear start and hold.
z The torque converter clutch can apply and release.
z Improved traction and engine braking on slippery roads.
z Engine braking for descending steep grades.
First Position
If this position is selected at normal road speeds, the transmission will shift into second gear, then into
first when the vehicle reaches a speed below approximately 45 km/h (28 mph).
This position provides:
zFirst gear operation only.
z Engine braking for descending steep grades. Klj . 2 ba
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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
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DESCRIPTION AND OPERATION
Disassembled Views
4R70W Automatic Transmission —
Disassembled View
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
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Item Part
Number Description
1 7902 Converter assembly (model dependent)
2 391855-
S100 Plug —
converter drain — 1/8-27 Dryseal (model
dependent) 3 7A103 Pump assembly —
front 4 7A248 Seal assembly —
front pump 5 7A248 Seal —
front pump 6 7B258 Bushing —
front pump 7 N605789-
S100 Bolt —
M8-1.25 x 35 hex head (7- attaches 7A103
to 7005) Klj . 2 ba
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