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If it's a rear axle bearing.....your best bet would be to remove the hub\bearing housing\axle assembly and take it to a shop to have it pressed out and new pressed back in. Make sure the seal is done at the same time.......There are a number of manuals (eg. Chiltons) that cover axle removal and replacement.
1. Drain diff if it has a plug. 2. Remove rear cover 3. Undo cross pin bolt and slide the cross pin out of the carrier 4. Push axle shaft in so you can remove the C clip axle retainers
5. Slide axle out of housing. 6. Remove axle seal and then replace axle seal 7. Reverse steps
If what you see leaking is very oily and does not evaporate, likely it is an axle seal. If there are no leaks in the brake system, that's the only thing back there that can leak. If the axle bearing is going away, it can damage the seal so make sure you look for small shiny metal flakes behind the seal when you replace it or you will be doing the job again very soon. Can't remember...that IS rear wheel drive right?
You should be ok replacing the outer seal but check for bearing play or fautly outer wheel bearing before you disassemble. If to much lateral movement in axle shaft it will take out your new seal rather quickley.
You will need to remove the differential rear cover,drain fluid, remove wheel, brake drum, (rotor) . Unbolt center diff. pin, carefully remove (don't loose shims) push axle in remove lock keeper, then slide out axle, replace seal, put some grease on it, slide axle in reverse all to install.
Jack up vehicle and support on stands. Remove wheels. Remove differential cover . Locate and remove lock pin that holds cross shaft in. Slide cross shaft out. Push axle inward to release axle c clip. Remove axle and pry out old seal. Install new seal with proper tool.Add some lube to the seal lip to aid axle intallation. Revese removal procedure. This is for a "c" type axle.
Another type has 4 nuts attaching a retainer plate to the backing plate behind the axle flange. In this case the 4 nuts are removed and the axle will come out. This may require a little effort. I think that you have a "c" type axle in your vehicle. Hope this helps. Moe
Raise and support the vehicle. For additional information, refer to Section 100-02 .
Remove the wheel and tire assembly. For additional information, refer to Section 204-04 .
Remove the differential housing cover (4033).
Loosen the bolts and drain the lubricant from the rear axle housing (4010).
Remove the bolts.
Remove the differential housing cover.
Remove the rear brake disc (2C026). For additional information, refer to Section 206-04 .
CAUTION: Turning the differential case (4204) or an axle shaft (4234) with the differential pinion shaft (4211) removed will cause the differential pinion gears (4215) to fall out of the assembly and damage the components. Remove the differential pinion shaft.
Remove the differential pinion shaft lock bolt.
Remove the differential pinion shaft.
CAUTION: Do not damage the rubber O-ring in the U-washer groove.
Remove the U-washer (4N237).
Push the axle shaft inboard.
Remove the U-washer.
Reinstall the differential pinion shaft.
Install the differential pinion shaft.
Install the differential pinion shaft lock bolt finger-tight.
CAUTION: Do not damage the wheel bearing oil seal (1177). Remove the axle shaft.
----------------------------------------------------------------------------------------------------------------- Seal Removal
Remove the axle shaft (4334). For additional information, refer to Axle Shaft in this section.
CAUTION: Never remove the wheel bearing oil seal (1177) by itself. Always remove the rear wheel bearing (1225) and the inner wheel bearing oil seal at the same time. NOTE: If the wheel bearing oil seal is leaking, the axle housing vent may be plugged with foreign material. Using the special tools, remove the rear wheel bearing and wheel bearing oil seal together.
Lubricate the new rear wheel bearing.
For 4.0L SOHC and 4.0L EI with limited slip rear axles and 5.0L vehicles, use SAE 75W-140 High Performance Rear Axle Lubricant F1TZ-19580-B or equivalent meeting Ford specification WSL-M2C192-A.
For 4.0L SOHC and 4.0L EI with conventional rear axles, use SAE 80W-90 Premium Rear Axle Lubricant XY-80W90-QL or equivalent meeting Ford specification WSP-M2C197-A.
Using the special tools, install the rear wheel bearing.
Lubricate the lip of the new wheel bearing oil seal.
Use Premium Long-Life Grease XG-1-C or equivalent meeting Ford specification ESA-M1C75-B.
Using the special tools, install the wheel bearing oil seal.
Install the axle shaft. For additional information, refer to Axle Shaft in this section.
if you are talking about the axle seals, 1.REMOVE THE WHEELS.2. REMOVE THE DIFF COVER(slowly)3.REMOVE THE BRAKE CALIPER ASSEMBLY.4.REMOVE THE 8MM PIN IN THE DIFF CARRIER. 5.TURN CARRIER AND REMOVE THE LARGE PIN.6. FIRMLY HIT IN THE AXLE, A SMALL RETAINING C CLIP WILL FALL INTO THE DIFF HOUSING. DO THE SAME WITH THE OTHER SIDE. ( be careful if you have rear speed sensors remove it when you remove the brake calipers . you will break it when you are pushing in the axles.)7.pull axles and replace seals