This is very hard if you do not know what you are doing. Ill try to step you through this
Jack up and support truck remove wheels and if disk remove caliper and brake if drum-drum only -remove cover and remove pinion shaft lock bolt slide pinion shaft out with help or yourself push an axle in from wheel side and remove c-clip slide axle out pry out old seal replace new slide axle in careful of seal replace c-clip do on other side replace pinion shaft and bolt done
Take wheel off, Undo the brake caliper, remove rotor, (Cant remember if you have to remove the parking brake shoes or not) If so do that next, ( If equipped with rear ABS remove sensor from axle housing) remove rear differental cover, remove locking bolt, (5/16) remove center rod, remove axle retainer clip, pull axle out, pull seal out, using a socket drive your new seal into place, Install in reverse order, Hope it helps
SOURCE: can not remove rear axle on chevy avalanche 4x4 1500.
you will need to take off the differential cover (drain and change diff oil at this time)
rotate the axle so that you can get at the cross pin and remove it by undoing a small bolt that holds it in place. it should slide out with ease, but i have had them stick, take care not to let the cross pin get lodged where it is difficult to extract
a single C-clip is holding each axle inside the differential housing
you will need to push in from the outer end of the axle, while simultaneously manipulating the C-clip off of the inner axle, repeat this same process on the other side
i will put some of pics up in a minute
SOURCE: Rear Axle Removal
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
SOURCE: REAR AXLE SEAL LEAKING ONTO BRAKE SHOES NEED INSTRUCTIONS ON HOW TO FIX
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
SOURCE: rear axle oil seal location for chevy 3500 dually
Here is a picture step by step guide from autozone:
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Rear+Axle&partName=Drive+Train&pageId=0900c1528008f4d4&subChapterTitle=Axle+Shaft%2C+Bearing%2C+And+Seal&partId=0900c1528008f406
SOURCE: Rear Axle Seal Replacement
remove rear tires, then remove brake calipers and rotors, then remove the 4 nuts (each side) that hold the axle shafts to the axle tube (located around the axle tube behind the backing plate) then using a slide hammer pull the axle shafts out, next using a die grinder and an air hammer get he retainer collar and the bearing off (without damaging the axle shaft) then remove the seal and the outer race which will still be in the housing. next put it all back together, make sure the plate with the studs is still on then slide the seal, bearing, then retainer on (all new parts) and using a press push them all the way back on. then is simple reassembly.
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