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Dana 27 ??

Discussion in 'Early CJ5 and CJ6 Tech' started by Buildflycrash, Jul 21, 2007.

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  1. Jul 21, 2007
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Gulf Breeze FL...
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    Can I run with the gear in that condition?

    Yep...run to the parts store. On foot. :D
     
    Last edited by a moderator: Jul 21, 2007
    Buildflycrash, Jul 21, 2007
    #1
  2. Jul 21, 2007
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    you can run an extension from the vent as high as you want to go....
    the race is over for those diff gears...
     
    jpflat2a, Jul 21, 2007
    #2
  3. Jul 21, 2007
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    What ratio is it? I'd look for a complete axle - should be cheaper than replacing the gears.
     
    timgr, Jul 21, 2007
    #3
  4. Jul 21, 2007
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

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    How much of a job is the diff. gear?
    Are parts easy to get?
    Am I going to need lots of other parts/seals,bearings,etc?
     
    Buildflycrash, Jul 21, 2007
    #4
  5. Jul 21, 2007
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

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    Is the ratio 3.73? That is one of the #s on the tag.
     
    Buildflycrash, Jul 21, 2007
    #5
  6. Jul 21, 2007
    Boyink

    Boyink Super Moderator Staff Member

    Tulsa, OK
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    Gahh....power of a mod with lack of an undo kills again. I edited your original post rather than replying.

    My apologies!
     
    Boyink, Jul 21, 2007
    #6
  7. Jul 21, 2007
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    The only thing you don't need to replace is the differential case. I would plan on all the bearings being trashed. There are numbers on the ring gear that will confirm the ratio. I don't know what the numbers are for the 3.73. It will be a large number then small number. I. E. 43-8 indicates 5.38 ratio. Since the spider gears are bad you might consider a locker, perfect time to install one.
     
    Glenn, Jul 21, 2007
    #7
  8. Jul 21, 2007
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    R) Pics? I know I saw some. R)
     
    Glenn, Jul 21, 2007
    #8
  9. Jul 21, 2007
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    If it's a 3.73, you should be able to find a replacement axle pretty easily.

    You can go to Randy's Ring & Pinion and look at the prices, but you'll be way over the cost of another used axle.
    http://www.ringpinion.com/DiffDetai...Side=Front&DiffID=10&DiffName=Dana+Spicer+D27

    Plus, setting up differential gears can be challenging for anyone but a pro. There's a lot to it, and you'll need to buy special tools.

    Dana 27 axles are not in great demand today, and even if you don't upgrade to a limited slip or locker, you might want to upgrade to a model 30 from a later CJ. There too, a 3.73 open axle (ie open gears - no limited slip) should be pretty easy to find, and significantly less expensive than fixing this axle.
     
    timgr, Jul 21, 2007
    #9
  10. Jul 21, 2007
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    I guesss i didnt see the other post about this. but if you have bad gears, but have done alot of other work to the rest of the axle (seals, bearings kingpin bearings) I would say repalce the gears and keep the axle. With the front axle since you do not use it much i wouldnt be as scared to setup the gears yourself, it would be good practise to try adn setup your own gears. But if everything on the axle is trash you may find it easier to swap to a differnt axle assembly. Its funny, i hardly see many 3.73 gears for the 27, i see mainly the lower gears for them.
     
    DanStew, Jul 21, 2007
    #10
  11. Jul 21, 2007
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    Huh. Yeah, could be, but it seems like there are a lot of members here with V6 CJs with 3.73 axles. Certainly the intermediates with standard 3.73 gears are a lot more common than the optional 4.27s. Either of those would be a good donor.
     
    timgr, Jul 21, 2007
    #11
  12. Jul 21, 2007
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    I always liked my 4.27 gears. i think that was the perfect ratio for me :)
     
    DanStew, Jul 21, 2007
    #12
  13. Jul 21, 2007
    Buildflycrash

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    Would the Dana 30 be an easy swap?
    Same hardware for attaching springs and driveshaft?
     
    Buildflycrash, Jul 21, 2007
    #13
  14. Jul 21, 2007
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

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    Good news! the rear Diff looks fine.

    Should there be a vent on the rear diff?
    I can't find one.
     
    Buildflycrash, Jul 21, 2007
    #14
  15. Jul 21, 2007
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    Yes, I think so, but I haven't done it.

    Quite a few here have though.
     
    timgr, Jul 21, 2007
    #15
  16. Jul 21, 2007
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    The left axle tube should have a small hole in it near the middle, probably on the back side, that's the actual vent. Best thing to do is plug that with something like silicone and put a vent in the cover like the front and run a line up.
     
    Glenn, Jul 21, 2007
    #16
  17. Jul 21, 2007
    wmunny

    wmunny Member

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    here are a couple of shots of the vent on a 44 rear.



    [​IMG]



    [​IMG]
     
    wmunny, Jul 21, 2007
    #17
  18. Jul 22, 2007
    Glenn

    Glenn Kinda grumpy old man Staff Member

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    Wmunny, what year is the axle in your pictures?
     
    Glenn, Jul 22, 2007
    #18
  19. Jul 22, 2007
    wmunny

    wmunny Member

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    glenn; it's a 69
     
    wmunny, Jul 22, 2007
    #19
  20. Jul 22, 2007
    Posimoto

    Posimoto Hopeless JEEP Addict

    Minden, Nevada
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    My '67 D44 doesn't have a vent.
     
    Posimoto, Jul 22, 2007
    #20
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