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The 1999 Ford Expedition is built on an F150 platform. The Expedition uses a 9.75-inch rear axle. The axles are retained with C-clips at the end of the axle shaft, inside the differential carrier. The axle bearings are of the roller type. A failed axle bearing can manifest itself as a noise at the rear wheel or gear oil leaking past the oil seal. When replacing axle bearings, the oil seals must also be replaced. Torque the caliper mounting bolts to 30 foot-pounds. Torque the bolt to 20 foot-pounds with a torque wrench and socket.Click this link below for complete detailed procedure:---http://technoanswers.blogspot.com/2011/06/how-to-remove-rear-wheel-bearings-on.html
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This should help.Thanks.Helpmech.
have to pull the diff cover,remove the small bolt that holds the pin,remove the pin . With wheels off ,push the axle in remove c-clip ,slide axle out. You will need a slide hammer to remove the bearing.(or pull both sides and drive out with a long piece of rebar from the other end)
Be sure to check the axle surface where the bearing rides,if is damaged the parts stores sell a repair bearing that makes the rollers ride in a different spot on the axle.(called "axle savers")
To remove the rear axle to replace a bearing you have to remove the rear differential cover and remove the small retaining bolt holds the spider gear shaft in place and then slide this shaft out far enough to remove the "C" shaped axle shaft retaining clip. Once this clip is off then the axle can be slid out and the bearing & seal replaced. Make sure that none of the spider gears or thrust washers behind them get out of place and you should use a new retaining bolt when reassembling the differential components as they come [or should come this way] with thread locker to prevent them from coming loose.
First thing is to make sure you chock the front tires so the truck will not roll. Raise the rear end and set it on jack stands. Put the transmission in Neutral and make sure the parking brake is off. Remove the rear tires and disassemble the brakes on the side with the leaking seal. Place a drain pan under the rear differential and remove the cover. Remove the differential shaft lock bolt. You will need to turn the drive shaft by hand to access the bolt. It will be on the right side off the spider gear housing. Only use a 5/16 or 8mm 6 point box end wrench to remove the bolt. After you remove the bolt reach on the top of the spider gear housing and push the differential lock shaft down to remove it. Make sure the spider gears do not rotate after you remove the shaft. If they do you will need to realign everything to reinstall the lock shaft. Push the axle shaft in enough to remove the "C" clip from the tip of it. The axle will now slide out of the rear end. You can use the tip of the axle shaft to remove the axle seal. If you're changing the bearing as well you will need a slide hammer with axle bearing adapters to remove it. You can use a socket and hammer to install the new bearing and seal. Be careful not to damage the bearing and seal. I recommend packing grease in the back side of the seal. This helps prevent the spring on the seal lip from coming off. Assembly is the reverse. Clean off all the gear oil from the differential cover and the axle. You can use RTV as a gasket if the OEM gasket is damaged. Fill the rear end with new gear oil of the proper type. Refer to your owner's manual.
REMOVE DIFF COVER ON 3rd MEMBER THERE WILL BE A SMALL 8mm BOLT REMOVE BOLT SLID PIN OUT PUSH AXLE IN AND REMOVE HORSE CLIP DO SAME FOR OTHER SIDE PUSH AXLE IN REMOVE CLIP. YOU'LL NEED A BEARING PULLER TO REMOVE BEARING INSTALL NEW BEARINGS WITH NEW SEAL, INSTALL BOTH AXLE WITH HORSE CLIPS INSTALL PIN AND 8mm BOLT, COVER AND REFILL.
once the pin is out, push the axle in towards the middle of the car, the clips may now come out, even fall out maybe. remove the clip, then pull the axle out. be sure that the axle bearing surface is good, any pitting or grooves and the axle and bearing and seal will need replacement.
Basic to get tire and hub off, remove rear diff cover remove bolt, remove clip, pull axle out, then heavy puller to pull bearing and seal. Ck axle for wear
If you have already removed the outer axle bearing cover in the rear hub, try popping the axle out as some of them have a compression clip holding it in place in the differential. If it doesn't pop loose, you wil have to remove the differential cover and push the axle inward enough to access the retaining clip to remove it. It should slide out fairly easile once the axle is pushed in far enough to clear the retainer clip lock collar.
Not that difficult, raiseand support the rear of the truck and remove the wheels. Might as well replace both sides so you know you have new seals, remove the differential cover and drain the fluid. Once differential is opened and cleaned , remove the axle "C" clip that hold the axle in place and slide the axle out. Once the axle is out remove the wheel seal and clean around the area. This would be a good time to replace the wheel bearing too since you have access to them and there not that expensive. Install the new bearing and seal, note make sure you oiled the bearing and seal before installing it back and take care when installing the axle back in and "C: clip. Use RTV silicon gasket maker to seal the differential cover and wheels back on and lower. If your lazy like i am, you can drain the differential fluid and replace it with a 50/50 mix with gear oil and Lucas engine oil additives. That may stop the leak and get you a few more miles. You gear oil is (ford 75W-140) (Dana 80W-90)and the capacity is 2.6 liters and 3.5 liters if you have the 10.25 Ring gear. Good luck and hope this helps.
Not 100% sure on that vehicle & don't have manual on it at this time, but will say very common that it does have "C" like clip at end of axle. Large pin comes out first, then push axle in slightly & remove clip, & slide axle out.
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