Axle seals are leaking again

Transmission and Drivetrain Tech

  1. harrisonm

    harrisonm Well-Known Member

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    So my axle seals are leaking again. 69 barracuda 8 3/4 and 489 center section with original axles and street driven only. I replaced the seals about 8-10 years ago, and I noticed at the time that the axles had a very minor groove where the seals rubbed on the axles. I’m wondering if it will do any good to put new seals in if those grooves have gotten any worse. I think it is kind of like putting a new rear main seal in when the engine has 200,000 miles and there’s a groove in your crankshaft. It’s still going to leak. I wonder if anybody makes an oversize seal for these axles. I was thinking on just getting new axles with bearings already pressed on them and seals. What do you guys think? I hate to go to the trouble of putting new seals in if it’s still going to leak. If I do get axles, any suggestions? Thanks.
     
  2. Dana67Dart

    Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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    There are sleeves for other sealing surfaces maybe for axle?

    A machine shop might be able to regrind like a cam shaft / crank
     
  3. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

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    I’ve used Ready Sleeves in the past. But as far as I know they never made them for the axle.
     
  4. Dana67Dart

    Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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    You could have a 1/16 inch thick shim made and put that in first then put the seal in. Now seal is riding on a different place
     
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    • fishmens67

      fishmens67 Well-Known Member

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      Green bearing might be the ticket if you're not using it now.
      I've used the green bearing with no issues for years
       
    • Dana67Dart

      Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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      Agreeded, but I would still put a seal in. Ford 9" use a green type bearing and they have a seal as well.
       
    • dadsbee

      dadsbee FABO Gold Member FABO Gold Member

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      Axle seal leaking or the grease seal on the retainer?

      If it's the axle measure the current lip location before removing the seal and then don' t drive the new one in quite as far. You could also chuck the axle (bearings and all) in a lathe with a big enough through chuck and dress the seal surface so it's clean.
       
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      • Car Nut

        Car Nut Mopar Master

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        The new Green bearings don’t need a seal, they have an “O” ring on them that seals.

        Mopar Green Bearings for 8 3/4" (8.75) and Dana 60
         
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        • RustyRatRod

          RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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          Just asking, but did you replace all FOUR seals? The inner ones too?
           
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          • Jadaharabi

            Jadaharabi FABO Gold Member FABO Gold Member

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            Please tell us about the FOUR seals and what are you calling the inner ones.

            Are you talking about the foam and metal ones on each side of the backing plate?
             
          • Demonic

            Demonic Well-Known Member

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            If you overpack the bearings, the outer seals can leak, often after they get some heat in them.
             
          • Dana67Dart

            Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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            Another thought, is your axel vent open and clear, if not pressure could build up and it has to get out somewhere.
             
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            • RustyRatRod

              RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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              No. I'm talking about inner and outer seals on the 8 3/4. It has all rubber seals that press into the inner part of the housing.
               
            • Car Nut

              Car Nut Mopar Master

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              Can you post part numbers?
               
            • Jadaharabi

              Jadaharabi FABO Gold Member FABO Gold Member

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              .
              Or pictures also?
               
            • Car Nut

              Car Nut Mopar Master

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              I've found a picture.

              timkin-kit.jpg
               
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              • RustyRatRod

                RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                Those aren't the seals I'm talkin about. The seals I'm talkin about go in the housing behind the bearings. They are right in the diagram in the FSM.
                 
              • RustyRatRod

                RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                It is the seal closest to the housing behind the bearing. Almost everybody leaves those out.

                8.75 DIAGRAM.jpg
                 
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                • RustyRatRod

                  RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                  Yeah....those fat ones I think are the aftermarket replacements. The original Chrysler ones were all rubber. A lot of people leave those out, believe it or not.....AND a LOT of kits don't even come with them. I also see that Cass at Dr Diff is out of stock with them as well.
                   
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                  • Car Nut

                    Car Nut Mopar Master

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                    So these aren't the ones you're talking about?

                    timkin-kit - Copy.jpg
                     
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                    • Car Nut

                      Car Nut Mopar Master

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                      This is good to know. my new 8-3/4 axles didn't come with the outer seals.

                      Of course the inner seals are in the housing.
                       
                    • RustyRatRod

                      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                      Yeah I went back and agreed they are.....the original Chrysler ones were all rubber coated. I cannot count how many I've torn down over the years that had those just missing. People think you can just install the outer ones and go.
                       
                    • SGBARRACUDA

                      SGBARRACUDA ROY FABO Gold Member

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                      Those are the only ones i know about.
                       
                    • RustyRatRod

                      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                      Yeah, that could certainly cause a leak. I've never seen people leave the outer ones out. I eckon cause they are RIGHT THERE behind the flange, but I've torn down countless ones that were missing the inner seals. Not tore up. Just not there at all.
                       
                    • toolmanmike

                      toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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                      And the rear end lube does not lubricate the axle bearings!
                       
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