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  • rear pinion seal

    hey guys ! no matter what i do , no matter how many seals i put in my model 20 rear end , it will drip a little when i park it .it has no vibrations and spins great on the highway . the yoke "looks" great, no wear or grooves in it, but at 60 + bucks i hate to condemn it . i put it in under practically surgical conditions ( clean shaft with a bit of white lith ) but after the third shaft i'm getting a bit fustrated ... any thoughts ?

  • #2
    i assume you emery clothed that yoke sealing surface before you put it in, right? other than that is the sealing surface on the diff scratched of nicked? only two things i can think of right now

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    • #3
      pinion seal

      Are you running synthetic oil? I did that once and leaked all over the place, it's so thin a lot of older equipment can't contain it. If thats the case, try regular old 80w-90 or 75w-90.

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      • #4
        thanks for the thoughts , yes emery cloth and no to synthetic, even ran an aditive that says it helps stop leaks

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        • #5
          Long shot here, but are you sure the yoke is not out of round?
          Did you clean the yoke back far enough. See Link

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          • #6
            thanks , but i'm sure i did , if its out of round , i guess replacement is the only option right ?

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            • #7
              Originally posted by jackson
              thanks , but i'm sure i did , if its out of round , i guess replacement is the only option right ?
              If it is out of round. Then yes that is what you will have to do.

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              • #8
                leaking eh

                Have you checked to see if your breather on your diff is plugged? My 82 cj5 with the model 20 in it had the same problem. The da-gum breather hose was solid. Try checking that before you get too far along.

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                • #9
                  Originally posted by cj_straight_six
                  Have you checked to see if your breather on your diff is plugged? My 82 cj5 with the model 20 in it had the same problem. The da-gum breather hose was solid. Try checking that before you get too far along.


                  Make sure this is clear. I didn't think about that.

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                  • #10
                    I have an extra yoke if you need one. Have both the Ubolt and strap type.

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                    • #11
                      I have always been told that you need to coat the pinion splines with a gasket sealer or the oil will creap through the splines and leak out. I always use sealer to lube the metal part of the seal when I install one, just a little extra security.

                      If the pinion bearing is worn, it may allow the pinion shaft to move around and make the seal oblong, no garantee of feeling a vibration untill it gets realy bad.

                      Dumb question here, are you sure it is the seal leaking and not the cover gasket? Just checking.

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