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Changing diff bearings

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by talison79, Sep 25, 2001.

  1. talison79

    talison79 1/2 ton status

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    I have been getting a deep clicking noise almost like a tire rubbing coming from a 12 bolt. This only happens turning left with throttle. It has been doing this for some time and is getting worse, meaning less throttle has to be applied. It is not a tire rubbing , The ujoints and the wheel bearings are brand new. I opened the differential up and when you rotate the right axle, you can hear the rollers in the bearings click as they fall against the inner sleeve of the bearing. It's not a lot of room but they are worn. My question is to replace the bearings, I can just set up the carrier the same way it comes out, or do I need to set the pre load again? Do I have to worry about the pinion? Does anyone have any recommendations on bearings? Discount Auto can order Spicer bearings, I was going to use those. What are the torque specs on the differential of a 12 bolt? None of the books I have covers this. And if you have any suggestions on anything let me know.

    Thanks for any help.

    Talison79
     
  2. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    I can't help you personally but go to your library and see if you can dig up an old GM service manual. Those books have every axle for the particular year, all the numbers and answers for ya.
     
  3. hawglet

    hawglet 1/2 ton status

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    You can get away with just going with bearings and races,PROVIDED you be sure to put the shims and the bearing caps on the same sides as they came off of, or at least this is what I was told and did I went ahead and replaced my ring and pinion also so I did have to so some but only because of that replacement. Just hear-say, worked 4 me.

    Thanks, (in advance)
    Hawglet
    hawglet@excite.com
     
  4. Pugsley

    Pugsley 1/2 ton status

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    Here's the torque specs - pugsley.alloffroad.com
     
  5. beater74

    beater74 1/2 ton status

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    yo sounds like a good lill project give me a call and i'll give ya a hand. it would be good to know how to do it see'n i'll probably need to do mine soon.
     
  6. ftn96

    ftn96 1/2 ton status

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    Yes, you can replace the carrier bearings with relative ease. The pinion is the mother, but you dont have to mess with that.
    The biggest thing here is that your normally want to take a current backlash reading before swapping the bearings, but is yours are that far gone your gonna have some crazy ass reading.
    But what I would do is take the new bearings and the original shims adn re-install. adn check your backlash. Your probably gonna wanna get your backlash set to around .010-.012.
    New gears are generaly close to .008 +- .004. As the gears wear adn settle in the .008 will open up as time goes on. So I'd say you be ok, to let them go with the 10-12.
    You will need to get a dial indicator with magnetic base. Relatively cheap from Jcwhitney or harbor freight.
    If the original shims dont give you the desired number then you'll need to add or substract shims to get the numbers right.
    Add shim on left and subtract = amount from the right to decrease backlash.
    And just the opposite to increase backlash.
    Hope this helps.

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  7. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    You can get away with it. REPLACE BOTH BEARINGS AND THE RACES! Make sure the bearings come out of the same box so that they are as close to the same dementions as possible like it was when the thing was assembled. Take some white lythium greas and coat the gears (about 1/3 of the way around) and drag your hand on the carrier while simming it both dirrections with the pinion. Look at the gear pattern that will be left in the grease. If you got a poloroid take a picture. If you have a dial gage then check the back lash. SHould be between 5 and 8 thousands. Pull the bearing caps. SIDES ARE IMPORTANT! make sure that when you take parts out they go back in the side they came out of. Yank that puppy out and be very carefull to catch the shims.
    Take the carrier to a machine shop and have them press on the new bearings and put it back together. It may be very snug going back in and that's normal as long as it spins free. it will loosen up a little once they run. Regrease and check the pattern. If it looks the same your set. The back lash should come up the same or maybe just a little less. Lock tite the bearing caps. I think the torq on them is 70ftlb's.
    I have done this twice with no problems. Also inspect the cross pin and the c-clips for excessive wear. If they are worn I think I have a spare cross pin and maybe a set of clips.

    I don't need no damn shop manual, I got a pornographic memory.
    <a target="_blank" href=http://communities.msn.com/OffroadK5s>communities.msn.com/OffroadK5s</a>
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    Grim-Reaper
     
  8. ftn96

    ftn96 1/2 ton status

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    I love it when Grimmy comes in with the attention to detail. [​IMG]
    I always seem to get lost when Im typing anything over 4 sentences. [​IMG]

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  9. talison79

    talison79 1/2 ton status

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    Hey guys thanks for the input. I thought the caps were a little light coming off. They were about 35 ft lb's. Hey grim I will take the pictures and maybe you can do the wright up on the budget backyard rebuild. I did a search and didn't find much on this . The write up on Steve's rear end, just didn't have that colorful something that you can add Grim. Well thanks guys. If anybody thinks of anything else let me know . God know I need all the help I can get. Hey beater74 I will see you this weekend. Well try out that new winch. There is this big tree right outside the garage . We can just run that thing up a tree instead of climbing under it.

    Talison79
     
  10. beater74

    beater74 1/2 ton status

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    cool i'll be there but i might have to run my mother-inlaw around alittle on sat. she wants to buy a new dinet
     

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