How do I remove and replace the rear wheel bearing for a 2004 ford mustang gt?
SECTION 205-02B: Rear Drive Axle/Differential — Ford 8.8-Inch Ring Gear
2003 Mustang Workshop Manual
IN-VEHICLE REPAIR
Axle Shaft
Removal
CAUTION: Do not damage the rubber O-ring in the axle shaft groove.
Remove the U-washer (4N237).
CAUTION: Damage to the rear brake anti-lock sensor (2C190) may occur if it is not removed before the axle shaft.
Carefully remove the rear brake anti-lock sensor. For additional information, refer to Section 206-09A .
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CAUTION: Do not damage the wheel bearing oil seal.
Remove the axle shaft.
Rear Wheel Bearing and Axle Shaft Oil Seal
Removal
Installation
Using the special tools, remove the rear wheel bearing and wheel bearing oil seal.
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Installation
CAUTION: Do not damage the wheel bearing oil seal.
Install the two axle shafts.
CAUTION: Do not damage the rubber O-ring in the axle shaft groove.
Install the U-washer.
Install the differential pinion shaft.
If you have IRS, Independent Rear Suspension. here is the procedure for a Cobra wheel bearing:
SECTION 204-02: Rear Suspension
2003 Mustang Workshop Manual
REMOVAL AND INSTALLATION
Wheel Hub —Cobra
Removal CAUTION: Suspension fasteners are critical parts because they affect performance of vital components and systems and their failure can result in major service expense. A new part with the same part number must be installed if installation becomes necessary. If substitution is necessary, the part must be of the same finish and property class. Torque values must be used as specified during reassembly to make sure of correct retention of these parts. Remove the rear wheel knuckle (5A968/5A969). For additional information, refer to Wheel Knuckle—Cobra in this section.
Removal
Mark the rear shock absorber (18125) relative to the protective sleeve with the vehicle in a static, level ground position (curb height).
Raise the vehicle on a hoist. For additional information, refer to Section 100-02 .
Remove the wheel and tire assembly. For additional information, refer to Section 204-04 .
Remove and discard the rear hub retainer (4B477).
Disconnect the parking brake cable and conduit from the parking brake lever.
Remove the clip and disconnect the parking brake cable and conduit from the rear brake caliper.
Disconnect the parking brake cable and conduit from the knuckle (5A968/5A969).
Remove the rear brake disc. For additional information, refer to Section 206-04 .
Support the lower suspension arm and bushing (5A649) with a jack stand.
Remove the nut and bolt and disconnect the shock absorber (18125) from the lower suspension arm and bushing. Discard the nut and bolt.
Remove and discard the cotter pin and nut.
CAUTION: Do not strike the toe link or the knuckle to disconnect the toe link. The toe link or the knuckle can be damaged.
Using the special tool, disconnect the toe link (5K899) from the knuckle. 
Mark the cam bolt position relative to the upper suspension arm and bushing (5500).
NOTE: Mark a new cam bolt in the same position as the old one for assembly reference before discarding the old bolt.
Disconnect the upper suspension arm and bushing from the knuckle. Remove and discard the nut and bolt.
Disconnect the arm and bushing from the knuckle.
Using the special tool, press the axle shaft from the hub (1109).
Remove the knuckle from the lower arm and bushing.
Remove and discard the nut and bolt.
Remove the knuckle.
Remove the dust shield, hub, snap ring and bearing from the knuckle. For additional information, refer to Wheel Hub—Cobra in this sectionve the bolts and the dust shield. Discard the bolts.
Position the knuckle in a vise.
NOTE: There are two methods for removing the rear hub (1109) from the rear wheel bearing (1A049). Both methods are shown.
Method one. Using the special tools, remove the hub. 
Method two. Using the special tools, remove the hub.
Remove the snap ring.
Press the wheel bearing from the knuckle.
Position the knuckle on the press bed supported by the special tool.
Using the appropriate step plate adapter, press the bearing from the knuckle.
Installation Install the bearing.
Position the knuckle on the press.
Using the appropriate step plate adapter, press the bearing into the knuckle until the bearing clears the snap ring groove and bottoms out in the bore.
Install the snap ring.
CAUTION: The bearing inner race must be supported during hub installation. Failure to follow these instructions can damage the bearing.
Install the hub. Position the knuckle in a press, making sure the wheel bearing inner race is supported with the appropriate step plate adapter.
Using the special tool, install the hub.
Install the dust shield and new bolts.
Inspect the bearing dust seal. If necessary, install a new dust seal.
Using a hammer and chisel, remove the dust seal.
Using the special tools, install the dust seal.
Install the knuckle. For additional information, refer to Wheel Knuckle—Cobra in this section.
the last 4 illustrations show the special tools
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Jack the car up and put it on safety stands, then remove the rear wheel of the bearing u are replacing, put a drain pan under the center of the diff and remove the cover, remove the retaining bolt for the center pin that is between the spider gears or the posi clutch packs, (if u have positraction) remove the center spring (posi) and then remove the axle "C" clips, pull the axle(s) out and press new bearing into case or on to axle as required, reassemble in reverse order, use silicone rubber sealer (permatex is best) on diff cover, fill with correct 80-90W positraction gear oil and add one bottle of friction modifier (Ford or aftermarket ok), fill to just below the plug (about one finger joint below) on side of center housing. That was easy.
oh well, tied to help,
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CAUTION: Suspension fasteners are critical parts because they affect performance of vital components and systems and their failure can result in major service expense. A new part with the same part number must be installed if installation becomes necessary. If substitution is necessary, the part must be of the same finish and property class. Torque values must be used as specified during reassembly to make sure of correct retention of these parts. 
Its a double bearing set. Independant rear suspension. No c clips.
What is the special tool?
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