SOURCE: Rear Main Seal Leaking
Hello, it's not "easy" but, it's doable.
You'll need to follow the instructions and don't take shortcuts. ask for help if you need it.
Use this link to get an idea of what is involved. Ignore the "remove transmission" part. It can be done without removing the tranny. If you decide to do this buy a service manual to help you. If you have any questions feel free to ask.
Here is the link:
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152801caf2a
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: 2001 Silverado 1500 Z71 4x4 oil leak
i had the same problem and it turned out to be the gasket on the rear main seal housing not the rear main seal.
SOURCE: how do you replace an oil pump for a 93 chevy
A bad oil pump will show low oil pressure and your lifters will start chattering. It is rare that ann oil pump failsyet possible.The oil pump is in the oil pan and will require the pan to come down. The pan can be remove in frame, you just have to turn the crank by hand to get the crank journal out of the way at a certain point. Yhe oil pump is the unit the pick up tube and screen are attached and it comes down by removing two bolts.The pick up tube is the hard part. Last I kmew they are pressed in and hard to separate from the pump, but it can be done. Be careful not to rotate the tube or it will be loose on install, not good.. If you have a oropane torch heat up the pump, don't over heat. Just enough fotr the tube to dlip out. Do not forget to put the distributor drive rod back in if it came out wiyh the pump. Pull the distributor so you don't fight thre drive slot alignment. Note rotor position and dirtibutor body position. Mark if necessary the orientation for assembly. Good Luck. Suggestion. Have the oil pressure ck'd and verified befor siassemblin. Put a gauge in place of sending uni for a direct reading. It's a lot of work to pull the pump. Good Luck, -Ned-
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