2003 FORD MUSTANG AUX

Installation
1. Lubricate the engine front cover and the crankshaft front seal inner lip with clean engine oil.
2. Using the special tool, install the crankshaft front seal.
3. Install the crankshaft pulley. For additional information, refer to Crankshaft Pulley in this section.
4. Install the auxiliary crankshaft pulley. For additional information, refer to Crankshaft Pulley —
Auxiliary in this section. Klj . 2 ba
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49. Remove the auxiliary crankshaft pulley. For additional information, refer to
Crankshaft Pulley —
Auxiliary in this section.
50. Remove the clutch. For additional information, refer to Section 308 - 01 .
51. Remove the transmission wiring harness. 1. Remove the RH oxygen sensor connector from the bracket.
2. Disconnect the transmission wiring connector and remove the harness.
52. NOTE: LH is shown, RH is similar.
Remove the right and left exhaust manifold flange nuts, and position the exhaust manifold
aside.
53. Drain the engine oil. zInstall the drain plug when finished. Klj . 12 ba
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18. Install the clutch. For additional information, refer to
Section 308 - 01 .
19. Install the auxiliary crankshaft pulley. For additional information, refer to Crankshaft Pulley —
Auxiliary in this section.
20. Install the battery tray and the mounting bolts.
21. Position the power steering hose into the grommet.
22. Install the bracket mounting bolt.
23. Position the power steering hose and tighten the fitting. Klj . 6 ba
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6. Remove auxiliary crankshaft pulley. For additional information, refer to
Section 303 - 01C .
All engines 7. Rotate the belt tensioner and remove the accessory drive belt.
8. NOTE: Make sure the accessory drive belt is correctly installed on each pulley.
To install, reverse the removal procedure. zRefer to Accessory Drive and
Accessory Drive — Cobra for accessory drive belt routing. Klj . 2 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
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
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DIAGNOSIS AND TESTING
Transmission Fluid Cooler
CAUTION: Whenever a transmission has been disassembled to install new parts, the
cooler bypass valve (CBV), all transmission fluid coolers (in tank and auxiliary) and
transmission fluid cooler lines must be cleaned and backflushed. Use a suitable the torque
converter/fluid cooler cleaner.
NOTE: Cleaning and backflushing the transmission fluid cooling system along with following all the
normal cleaning and inspection procedures in this section during disassembly and reassembly will
keep contamination from reentering the transmission and causing a repeat repair.
When internal wear or damage has occurred in the transmission, metal particles, clutch plate material,
or band material may have been carried into the torque converter and transmission fluid cooler. These
contaminants are a major cause of recurring transmission troubles and must be removed from the
system before the transmission is put back into use.
Transmission Fluid Cooler Flow Test
NOTE: The transmission linkage/cable adjustment, fluid level and line pressure must be within
specification before carrying out this test. Refer to Section 307 - 05 for adjustments.
1. Remove fluid level indicator from fluid filler tube.
2. Place funnel in fluid filler tube.
3. Position the vehicle on a hoist. For additional information, refer to Section 100 - 02 .
4. Remove the cooler return line (top fitting) from the fitting on the transmission case.
5. Connect one end of a hose to the cooler return line and route other end of the hose up to a point where it can be inserted into the funnel at the fluid filler tube.
6. Remove the safety stands and lower the vehicle. Insert end of hose into the funnel.
7. Start the engine and run it at idle with the transmission in NEUTRAL.
8. When fluid flows from the hose in a steady stream, a liberal amount of fluid should be observed. "Liberal" is about 1 liter (1 quart) delivered in 15 seconds. If a liberal flow is observed, the test is
complete.
9. If the flow is not liberal, stop the engine. Disconnect the hose from the cooler return line and connect it to the converter outlet fitting (bottom fitting) on the transmission case.
10. Repeat steps 6 and 7. If flow is now approximately 1 liter (1 quart) in 15 seconds, refer to Transmission Fluid Cooler — Backflushing and Cleaning in this section. If the flow is still not
approximately 1 liter (1 quart) in 15 seconds, repair or install pump and or converter.
For the installation of new transmission fluid cooler or tubes, refer to Section 307 - 02 .
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
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DISASSEMBLY AND ASSEMBLY OF SUBASSEMBLIES
Torque Converter Cleaning And Inspection
1. If a new torque converter is being installed, continue with Substep 2 of Step 2.
2. If a new torque converter is not being installed, the following procedures must be performed: 1. The torque converter must be thoroughly cleaned.
„Torque converters with drain plugs can be cleaned by using a suitable torque
converter/fluid cooler cleaner.
„ Torque converters without drain plugs can be cleaned by hand. Partially fill the
torque converter using only recommended transmission fluid for the applicable
transmission. Hand agitate the torque converter and then thoroughly drain the
fluid. Refill the torque converter with clean automatic transmission fluid specified
for transmission, and reinstall.
2. All in- tank and auxiliary coolers must be thoroughly cleaned by forward and backward
flushing. For additional information, refer to Transmission Fluid Cooler — Backflushing
and Cleaning in this section.
3. All cooler lines must be thoroughly cleaned by backward and forward flushing. For additional information, refer to Transmission Fluid Cooler — Backflushing and Cleaning
in this section.
4. All Cooler Bypass Valves (CBV), if equipped, must be thoroughly cleaned.
5. Carry out the Transmission Fluid Cooler Flow Test. For additional information, refer to
Transmission Fluid Cooler — Backflushing and Cleaning in this section.
6. If the transmission cooling system fails the Transmission Fluid Cooler Flow Test, a new fluid cooler, cooler bypass valve, and/or cooler lines must be installed. For additional
information, refer to Section 307 - 02 .
7. If new coolers are to be installed, use only factory approved service parts.
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Material
Item Specification
MERCON® V Automatic
Transmission Fluid
XT
-5-QM, XT -5-DM MERCON® V Klj . 1 ba
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