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Rear Diff Problems

Discussion in 'Early CJ5 and CJ6 Tech' started by Chevallier87, Mar 10, 2015.

  1. Mar 10, 2015
    Chevallier87

    Chevallier87 Member

    Boise Idaho
    Joined:
    Apr 21, 2012
    Messages:
    230
    Hi all,

    Going through my rear axle today, noticed that when I turn the rear hub by hand theres a helacious grinding noise...but when I turn the pinion there isnt that same noise. Also my pinion moves about a 1/8th inch front and back....Im not sure what any of these noises or lose things mean, so I'd love some information!

    Video for those who can see it.
    [video=youtube;FVlsnOsAqqI]https://www.youtube.com/watch?v=FVlsnOsAqqI[/video]
     
    Last edited: Mar 10, 2015
  2. Mar 10, 2015
    47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

    USA
    Joined:
    Oct 25, 2006
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    5,798
    spider gears working when you move one shaft.
     
  3. Mar 10, 2015
    Chevallier87

    Chevallier87 Member

    Boise Idaho
    Joined:
    Apr 21, 2012
    Messages:
    230
    Is it supposed to sound like that though? I moved both rear hubs and it only makes noise on the right.
     
  4. Mar 10, 2015
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Jan 23, 2014
    Messages:
    4,170
    The most concerning issue you have is the pinion shaft. It should not move "in and out" at all. If it does, your pinion bearings are worn beyond use. With the pinion moving around, even slightly, it is tearing up you ring gear too.
    It will need to be pulled apart and repaired. My guess your bad noises are directly related to the loose pinion bearings.
    -Donny
     
  5. Mar 11, 2015
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
    Messages:
    5,466
    That is indicative of an axle that needs to be rebuilt.
     
  6. Mar 11, 2015
    Chevallier87

    Chevallier87 Member

    Boise Idaho
    Joined:
    Apr 21, 2012
    Messages:
    230
    Sourcing OE parts....just gotta get some tools now :rofl:

    My Axle: 941866 (Model44) - Tapered Axle Shaft w/o power-lok

    Parts for Rebuild:
    Kits: Drive gear and pinion (3.73:1)..........937824
    Differential Gear repair kit................916361

    Don't know if that would be helpful to anyone but hey, there ya go :)
     
    Last edited: Mar 11, 2015
  7. Mar 11, 2015
    Focker

    Focker That's a terrible idea...What time? Staff Member

    WA
    Joined:
    Aug 18, 2014
    Messages:
    7,540
    Was that sound something you could hear with the diff cover on?
     
  8. Mar 11, 2015
    Rralphs

    Rralphs Old Member

    Nederland, Co
    Joined:
    Dec 12, 2004
    Messages:
    270
    Tighten the pinion nut?
     
  9. Mar 11, 2015
    Chevallier87

    Chevallier87 Member

    Boise Idaho
    Joined:
    Apr 21, 2012
    Messages:
    230
    Yessir it was...and I tried tightening the pinion nut too..didnt draw up any play in the pinion
     
  10. Mar 11, 2015
    WorkInProgress

    WorkInProgress Member

    Kennewick, Wa
    Joined:
    Jul 15, 2012
    Messages:
    966
    FYI if you end up tackling a rear end rebuild you will need a few tools like a heavy duty hub puller, a dial indicator, and not necessary but nice if you don't want to hurt your back is a slide hammer with a otc 8040 5/8 to 1 adapter for pulling the shafts out
    [​IMG]
     
    Last edited: Mar 12, 2015
  11. Mar 18, 2015
    djbutler

    djbutler Sponsor

    Rio Linda CA
    Joined:
    Nov 5, 2007
    Messages:
    727
    Hayden,
    If you plan to rebuild that axle yourself you will need a serious bearing puller for the differential side bearings as well as the pinion bearings. You will also need access to a press to put the new bearings on.

    With a new ring and pinion plan on making several assembly/read pattern/dissasemble sequences. Getting the pinion stack thickness correct is critical to setting up the ring and pinion mating fit, and if that fit isn't correct the ring and pinion will shortly self destruct. The tools to do this quickly runs into several hundred $$$. If you don't already have the bearing puller tools, dial indicator and a press, I'd take it to a shop and pay them to do the setup.

    Don
     
  12. Mar 18, 2015
    Chevallier87

    Chevallier87 Member

    Boise Idaho
    Joined:
    Apr 21, 2012
    Messages:
    230
    Don,

    I was thinking about that. If I just get the parts, which I have found just need the money, I know a few axle shops in town that quoted me a decent price, 250$ or at least I think its a fair price, to put it together.
     
  13. Mar 19, 2015
    djbutler

    djbutler Sponsor

    Rio Linda CA
    Joined:
    Nov 5, 2007
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    727
    $250 is a fair price for that job.

    Don
     
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