FORD MUSTANG 2003 Workshop Manual

Klj . 3 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

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~ ...

Klj . 2 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Torque Converter
The torque converter transmits and multiplies torque. The torque converter is a four-
element device:
z impeller assembly
z turbine assembly
z reactor assembly
z clutch and damper assembly
The standard torque converter components operate as follows:
zRotation of the converter housing and impeller set the fluid in motion.
z The turbine reacts to the fluid motion from the impeller, transferring rotation to the geartrain
through the input shaft.
z The reactor redirects fluid going back into the impeller, allowing for torque multiplication.
z The clutch and damper assembly dampens powertrain torsional vibration and provides a direct
mechanical connection for improved efficiency.
z Power is transmitted from the torque converter to the planetary gearsets and other components
through the input shaft.
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Item Part Number Description
1 — Converter clutch and damper (part of 7902)
2 — Reactor (part of 7902)
3 — Turbine (part of 7902) Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

4 — Impeller (part of 7902)
5 — Fluid motion
6 — Transmission input rotation
7 — Input shaft
8 — Engine rotation Klj . 2 ba
22003 Mustang Workshop Manual
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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
52003 Mustang Workshop Manual
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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
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...