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Jul 21st, 2025 | | | | Joined: Oct 2009 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2009 Posts: 59 | Hey everyone,
Been driving my '66 C50 lots recently and after a long trip, I noticed a streak of oil on the outside of the inner rear tire. Further investigation revealed what smelled to be gear oil coming out from the inside of the brake drum. I'm guessing that I've had an axle seal fail. Anyone else on board with that idea?
If that is the case, does anyone have the P/N for the proper seal that would fit the 15,000lb single speed axle under my truck?
Brian | | | | | Joined: Jul 2005 Posts: 581 Shop Shark | | Shop Shark Joined: Jul 2005 Posts: 581 | Could be your pinion seal as well. Mine flings it to the outer surface of the inner tires. It would be on both tires if this is the case. | | | | | Joined: Nov 2005 Posts: 6,061 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,061 | Hy Brian Lohnes, the o.e.m. p/n for the rear wheel "seal unit" is 3901014, that translates into 5453 National, also the same as Napa p/n NOS 162, hope that helps.
Last edited by 3B; 05/16/2011 1:40 AM. Reason: added Napa info
| | | | | Joined: Oct 2009 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2009 Posts: 59 | | | | | | Joined: Jan 2008 Posts: 4,903 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,903 | If it is actually your wheel seal, your brake pads will be soaked and are junk. | | | | | Joined: Oct 2009 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2009 Posts: 59 | Cren, judging from where it is coming from, the shoes will be wet (and ruined).
Brian | | | | | Joined: Dec 2006 Posts: 92 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 92 | Also Brian, after you've replaced the seal make sure the vent on the rear end isn't plugged. If it is plugged the heat and little bit of pressure that could build up on your longer trips might be pushing the grease out.
1948 Chevy 6400
1964 Chevy 1/2 Ton
| | | | | Joined: Oct 2009 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2009 Posts: 59 | Hmmm....I pulled the old seal and I've obviously gaffed up somewhere because the new seal is significantly larger than the one that came out.
Have I misidentified the axle?
The number stamped into the one that I removed is: 3974848 (it is a national seal)
The number stamped into the new one is: 6696S
| | | | | Joined: Jan 2008 Posts: 4,903 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,903 | I have been replacing wheel end seals for 50 years. I learned a long time ago to pull the hub, identify the seal, and go to the parts house and get one. The same rear end may have different wheel ends and seals on different applications. A good parts house can take the national p/n and do something with it. | | |
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