2003 FORD MUSTANG clutch

DESCRIPTION AND OPERATION
Geartrain
Power is transmitted from the torque converter to the Ravigneaux geartrain components through the
input shaft and forward clutch cylinder.
zThe geartrain contains a Ravigneaux planetary set connected by dual pinion gears.
z By holding or driving certain components of the gearset, four forward ratios and one reverse
ratio are obtained and transmitted to the output shaft. The ratios are as follows:
z Components of the geartrain can be held by bands or clutches and driven by clutches only.
The 4R70W uses:
ztwo bands.
z two one- way clutches (one roller, one mechanical diode).
z four friction clutches.
Planetary Gearset
The planetary gearset in the transmission is a Ravigneaux- type set consisting of the following
components:
zforward clutch sun gear
z reverse clutch sun gear
z a pinion carrier
z long and short pinions
z output ring gear
Components are held or driven to produce forward and reverse gear ratios.
Input Shaft
The forward clutch cylinder and shaft transfers speed and torque from the converter turbine to the
geartrain. This shaft is splined to the turbine on one end and to the forward clutch sun gear and stub
shaft on the other end. SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Gear Ratio
1st 2.84 to 1
2nd 1.55 to 1
3rd 1.00 to 1
4th 0.70 to 1
Reverse 2.32 to 1 Klj . 1 ba
22003 Mustang Workshop Manual
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Stub Shaft
The stub shaft transfers power from the input shaft to the planet carrier (through the direct clutch)
during third and fourth gear operation.
Output Shaft
The output shaft provides torque to the driveshaft and rear axle assembly. It is driven by the ring gear
of the planetary gearset. Klj . 2 ba
22003 Mustang Workshop Manual
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DESCRIPTION AND OPERATION
Apply Components
There are eight apply components used to drive or hold the planetary gearset components.
Band—
Overdrive
The overdrive band holds the reverse clutch drum stationary in fourth gear and manual 2. This action
causes the reverse sun gear to be held in these ranges.
Band— Low and Reverse
The low and reverse band holds the pinion carrier in reverse. The reverse band also applies in manual
1 position to provide engine braking.
Clutch— Intermediate Intermediate Clutch Disassembled View SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Item Part Number Description
1 7F196 Overdrive band assembly
2 7D044 Reverse clutch drum assembly
Item Part Number Description
1 7A398 Planetary assembly
2 7D095 Reverse band assembly Klj . 1 ba
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The intermediate clutch works with the intermediate one-
way clutch to hold the reverse sun gear
stationary in second gear. The intermediate clutch remains applied in third and fourth gears, but does
not transmit power.
Clutch— Forward
The forward clutch couples the forward clutch cylinder and input shaft to the forward sun gear in first,
second, and third gears. The forward clutch is not applied in fourth gear. Item Part Number Description
1 7B442 Intermediate clutch plates (steel)
2 7B066 Intermediate clutch pressure plate
3 391267-
S Retaining ring
4 7A089 Intermediate one-
way clutch assembly 5 7B164 Intermediate clutch plates (friction)
Item Part Number Description
1 7F207 Forward clutch cylinder and input shaft assembly
2 7E085 Rear clutch pressure plate spring
3 7B442 Forward clutch plate external spline (steel)
4 7B066 Forward clutch pressure plate
5 7D483 Snap ring —
retaining (select fit) 6 7B067 Forward clutch hub
7 7A399 Forward clutch sun gear assembly
8 7B164 Forward clutch plate internal spline (friction) Klj . 2 ba
52003 Mustang Workshop Manual
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Clutch—
Direct
The direct clutch couples the input shaft to the planet carrier through the stub shaft in third and fourth
gears.
Clutch—Reverse Item Part
Number Description
1 7F351 Intermediate stub shaft
2 7A398 Planetary assembly
3 7D483 Direct clutch pressure plate retaining ring (select
fit)
4 7B066 Direct clutch pressure plate
5 7B442 Direct clutch plates external splined (steel)
6 7B164 Direct clutch plates internal splined (friction)
7 7F283 Direct clutch cylinder assembly
Item Part
Number Description
1 7D044 Reverse clutch drum assembly Klj . 3 ba
52003 Mustang Workshop Manual
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The reverse clutch couples the input shaft to the reverse sun gear, applied in reverse range only.
One-
Way Clutch— Planetary (Low)
The planetary (low) one- way clutch is a roller clutch that holds the planetary gearset in first gear, (D)
and D ranges. During automatic coasting downshifts into first gear ((D) and D ranges), the planetary
one- way clutch freewheels so there is no engine braking.
One- Way Clutch— Intermediate 2 7B442 Reverse clutch plate external splined (steel)
3 7B066 Reverse clutch pressure plate (rear)
4 7D483 Reverse clutch pressure plate retaining ring
(select fit)
5 7F207 Forward clutch cylinder and input shaft assembly
6 7A019 Reverse clutch sun gear assembly
7 7B164 Reverse clutch plate internal splined (friction)
Item Part
Number Description
1 7A130 Planetary gear support assembly
2 7A089 Planetary one-
way clutch cage and spring roller
assembly 3 7A398 Planetary assembly
Item Part Number Description
1 391267-
S Retaining ring
2 7A089 Intermediate one-
way clutch assembly 3 7D044 Reverse clutch drum assembly Klj . 4 ba
52003 Mustang Workshop Manual
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The intermediate one-
way clutch works with the intermediate friction clutch to hold the reverse clutch
drum and reverse sun gear stationary in second gear during acceleration. The intermediate one- way
clutch freewheels in third gear and during coasting in second gear, (D) and D ranges. Klj . 5 ba
52003 Mustang Workshop Manual
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The transmission uses a gerotor-
type design front pump support and gear. The pump provides the
volume of fluid needed to charge the torque converter, main control assembly, cooling system and
lube system. Pump pressure is regulated by the main regulator valve. The pump has an internal boost
circuit which is more efficient at lower engine speeds.
Filter
All fluid drawn from the transmission pan by the pump passes through the filter. The filter and its
accompanying seal are part of the fluid path from the sump (pan) to the fluid pump.
Main Control
The main control valve body houses three electronic solenoids:
ztwo shift solenoids
z one torque converter clutch solenoid (TCC solenoid) Accumulators 1 — Outer rotor (part of 7A103)
2 — Inner rotor (part of 7A103)
3 — Outlet
4 — Inlet
Item Part Number Description
1 — Shift solenoid A (part of 7G484)
2 7G136 Torque converter clutch solenoid
3 — Shift solenoid B (part of 7G484) Klj . 2 ba
42003 Mustang Workshop Manual
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