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| | | | Joined: Oct 2002 Posts: 7 Member | | Member Joined: Oct 2002 Posts: 7 | My 49 1 ton has what I am told is a rear axle, hubs and drums from a 73-74 3/4 ton Chevy pickup.
I think the axle seals are leaking and I need to pull the hub&drum. I removed the hubcab and it was full of oil, confirming the outer seal is leaking. I have oil drips from the bottom of the brake drum which make me think the inner axle seal or possibly the wheel cylinder is leaking. I pulled the wheel drive shaft and the hub/drum turns freely, but will not come off with a puller. Is there a retaining nut that holds the wheel bearing in that needs to come off and if so how do you do this? Does it require a special tool? As always, I am a novice and sincerely appreciate any responses and help!
Bob
49 Chev 1 ton
55 **** 800 tractor
growing old is mandatory, growing up is optional
| | | | | Joined: Aug 2000 Posts: 346 Shop Shark | | Shop Shark Joined: Aug 2000 Posts: 346 | There is a pair of round nuts on the outside diameter of the axle tube with a sheet metal lock ring in between them. They have a series of notches on the face of them that a special 'hub wrench' fits into.
The lock ring will have one or more tabs bent over into the notches on the face of the outer nut to lock it in place. Pry the tabs out of the notch and up against the inner diameter of the hub to 'unlock' the outer nut.
Most people just use a hammer and a good sized punch to tap on the sides of the notches and turn the nut in lieu of the special tool.
I discovered a few years ago that the special nuts and lock rings to fit my '38 1-1/2 ton year end are still available from GM. They're listed for a late 90's 1-ton rear axle and are exactly the same as the '38 parts. I have the numbers if anyone is interested.
'38 Chevy 1-1/2 ton
'49 Chevy 1/2 ton
'54 Chevy 6400 2 ton
'55.2 GMC 3/4 ton
'56 GMC 1-ton
No Room Left in Shop
| | | | | Joined: Oct 2002 Posts: 7 Member | | Member Joined: Oct 2002 Posts: 7 | Thanks Olblue. I got things apart now and my question is - do the rear wheel bearings run in grease or oil from the rear end? There is a trace of grease in one of the old bearings, but the whole works was full of oil. Is it normal when you pull the axle shaft out to have about a cup of oil run out or was my differential over filled? Thanks again for any and all replies.
Bob
49 Chev 1 ton
55 **** 800 tractor
growing old is mandatory, growing up is optional
| | | | | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | Yes, the bearings run with oil. Yes, it is normal for that much oil to run out when you pull the axle-shaft out 
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