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How to: K2500 front rotor / disc replacement - 8 lug, 4x4

Discussion in '6.2 and 6.5 Technical Reference Library' started by WarWagon, Jan 6, 2010.

  1. WarWagon

    WarWagon Well it hits on 7 of 8...

    8,107
    2,439
    Nov 15, 2009
    AZ
    Drop the rig into 4x4 with the parking brake on. Or put the caliper on and have a friend stand on the brakes. Do not put any vehicle weight on a 'loose' bearing to tighten it.

    It is difficult to wrap your head around this, but, the 4x4 hub is two separate parts The half shaft spindle nut is on one side while the shoulder on other side of the splines are holding the back of the bearing in. Think of the standard 2WD tapered bearings with the nut setting the 'clearance'. (And do you know anyone that sets wheel bearing clearance with an impact?) Any load on the bearing spreads the bearing apart and loosens it up. You can have a new bearing that feels sloppy and it tightens up when you put the nut on the half shaft. Because it is a critical part of the bearing the TQ used on the half shaft nut is Critical!.

    Do not run the bearing without the half shaft in. In an emergency just put the splined part in and TQ that down. (I have seen this done.) Otherwise the bearing is sloppy and ruins the bearing and other things.

    Impacts like the 3/4 drive one uses to take the nut off could overtighten and destroy the bearing.
     
    jrsavoie likes this.
  2. GM Guy

    GM Guy Manual Trans. 2WD Enthusiast

    4,697
    505
    May 6, 2008
    NW Kansas and SC Idaho
    Excellent writeup WW, will be referring to this when I do the front bearings.
     
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  3. jrsavoie

    jrsavoie Recruit

    5,569
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    May 8, 2008
    Rural Clifton, Illinois
    find the other threads on upgrading to the newer style steering knuckle and hub. So you do not have to pull the bearing to change the rotors. I wish I had done that to mine as I went.
     
    WarWagon likes this.
  4. WarWagon

    WarWagon Well it hits on 7 of 8...

    8,107
    2,439
    Nov 15, 2009
    AZ
    How to: K2500 lug replacement - 8 lug, 4x4

    Yes, you can replace a stud without pulling the spindle. PO had a wheel come loose ruining the lugs and the rim. I used the big impact to snap one locked up lug nut off.

    Anyway it's only required to remove the brake caliper to access the lugs. (Yes there is a jack stand under the truck in addition to the jack.)

    DSCN4112.JPG DSCN4115.JPG DSCN4113.JPG

    Note the nut used as a spacer to tighten the lugs in and two left in at all times to keep things together.
     
    jrsavoie likes this.
  5. jrsavoie

    jrsavoie Recruit

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    May 8, 2008
    Rural Clifton, Illinois
    Last edited: Apr 3, 2018
  6. Will L.

    Will L. Well-Known Member

    7,288
    5,792
    Jan 25, 2013
    Boulder City Nv
    Yes all brands interchange. Harbor freight ones don't hold an edge long, but for blunt driving like this work great. Just be sure to remove "mushroom head" from the end as they wear just like you would a hand chisel.

    I learned long ago, invest in a really strong air hammer that is not too bulky. all the attachments for them, you will use it frequently. straight hammering, metal cutting, pickle fork attachment, fanclutch bolt, etc.
     
    MrMarty51, WarWagon and jrsavoie like this.

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