Excessive play, cv joint at diff.

Discussion in 'KJ General Discussion' started by fuseable, Feb 9, 2018.

  1. fuseable

    fuseable New Member

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    I have a 2002 Liberty that has started leaking at the front diff. where the half shaft enters the diff. I just put a new seal in a year ago and it is leaking again. It seems that there is excessive play at the diff. Is there a bearing inside the diff that controls movement of the cv shaft, is it serviceable? Maybe I should clarify it is the drivers side half shaft that goes from the diff. to the front wheel, has excessive play at diff. Not the pinion.
    thanks
     
    Last edited: Feb 9, 2018
  2. rockymountain

    rockymountain Full Access Member

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    Pinion bearing, yes. mine seeps enough to rust proof the area. LOL
     
  3. duderz7

    duderz7 Full Access Member

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    It's a male spline on the diff side of CV axle that pushes into the carrier, I believe those splines can wear and allow some slop. I think there's a bearing there too.
     
  4. HoosierJeeper

    HoosierJeeper Gold Supporter/Admin Staff Member Administrator

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    There are bearings at each end just inside the diff that can wear out.
     
  5. Renedave

    Renedave Full Access Member

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    The bearings inside the diff are the carrier bearings, and they don't just hold the axle shafts but hold the entire carrier in place. If they're gone you're looking at a regear since that amount of movement means you'll probably have wear between the ring and pinion gears.

    But, since the only symptom is a leaky axle shaft I wouldn't think that's the problem. I would check the axle shaft CVs and wheel hub at the for wear and extra play, and possibly notch it up to the seal not being aligned correctly or abused too much on installation before I'd tear into the carrier.
     
  6. HoosierJeeper

    HoosierJeeper Gold Supporter/Admin Staff Member Administrator

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  7. Renedave

    Renedave Full Access Member

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    Dang, I stand corrected - I see diff and don't think of anything but the center section. Yep, there's a bearing in the axle tubes that helps guide the axle shafts, part 22 on this drawing: https://www.4wheelparts.com/hardparts/HP_PartList.aspx?hpDID=141

    As far as I recall there was more play than I expected where the axle shaft went into the housing on the driver's side, noticeably more than on the passenger side, but I didn't have any leaks.

    The bearing is cheap enough I'd have one on hand with a bearing puller when you replace the seal again. You've already done 90% of the work to replace it anyway, and it's easy enough to inspect it and decide it it needs replacing while you have the seal out.
     
  8. u2slow

    u2slow Full Access Member

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    Agreed - not changing this bearing when you replace the shaft is a waste.

    The stock 'bearing' is a plastic bushing. The genuine Spicer part is a caged needle bearing... very similar to what you find inside an old-school Dana 44/60 spindle.
     
  9. HoosierJeeper

    HoosierJeeper Gold Supporter/Admin Staff Member Administrator

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    Mine has the caged metal bearings - so when I did my seal I left it alone.
     
  10. rockymountain

    rockymountain Full Access Member

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    Can anyone that has done this recommend what tools you need to pull this bearing and replace it?
    might be easy enough to just have a shop do it too I guess. I'm getting less and less eager to work on it.
     
  11. HoosierJeeper

    HoosierJeeper Gold Supporter/Admin Staff Member Administrator

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    A shop charged me $120 for a Mopar seal and the labor to do it. Can't imagine the bearing would be more. If you have the metal one I'd leave it. I replaced the seal twice on my own and it leaked.
     
  12. u2slow

    u2slow Full Access Member

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    Mine were really stuck. I had the front diff housing out, and carrier removed for locker install, so I drove it out with a socket and extensions from the opposite side.