Installing jba bolt on tri-angulated 4 link

Discussion in 'How To' started by tommudd, May 3, 2017.

  1. tommudd

    tommudd Moderator Staff Member Moderator

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    Been a few that have requested a how to on installing the JBA Bolt on Tri-Link.
    So here goes , or I'll try and explain, I'm one of those who doesn't read nor do How to's :emotions34::icon_razz:
    Tools,
    15 and 21 MM sockets and ratchet
    Jack and jackstands (although I normally don't use them since you can just roll underneath to install )
    * If lifting then install jackstands under the axle housing ( installing them under frame diff would hang down and would make it harder to install, IMO )
    * So now remove the KJ " balls " ( vibration dampener on the rear diff ) using 15 mm socket
    * After removing them loosing the front tri-link bolts which are 15 mm as well.
    * 3 bolts that hold the bracket on the diff are 21 mm , these can be a real *itch to remove at times so be ready.
    * Now loosen the LCA bolts they are 21mm
    * Now you are ready to install the JBA Bolt on 4 link
    * Fairly straight forward mount the rear bracket,
    * Cut and install the two arms ( they come longer and you'll need cut them down some depending on what height you are .
    * I ran mine on 4.5 inch lift about 18-18.5 inch eye to eye to get the angles I wanted your's will be different depending on lift. Forget now on the measurements on the 03 right now.
    * Use loc-tite on the bolts into the rear diff.
    Bolt everything back up and if have the rear diff hanging down drop on ground and tighten the rear LCA's .
    I think thats about it, If I remember anything I'll add.
    Will take pics next time I'm under mine

    Now take out and enjoy, you'll notice a difference from the get-go !


    Oh to to cut them just grab your Metabo Angle Grinder and then round the edges on your bench mounted grinder
     
    Last edited: May 3, 2017
  2. tommudd

    tommudd Moderator Staff Member Moderator

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    And since my Photobucket account that has Jeep pics on went on vacation, will find or take some later
     
  3. rockdart

    rockdart Full Access Member

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    Thanks! Tried to thank you in the PM, but it says you're out of storage space :happy175:


    Also - what I got from Marlin (and I'm gathering that these may just be starting points given what you have listed):

    2.5" lift - 18.5" eye to eye
    4" lift - 19.25" eye to eye

    Now you have me rethinking the process I was going to work - I'm going to be adding in those isolators when I do this, so was going to jackstand the body rails to get that pumpkin dropped and with the UCA out, should be a breeze getting the isolators in. Now I'm thinking I may need to drop it to put the arms on after the bracket is on.
     
  4. tommudd

    tommudd Moderator Staff Member Moderator

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    Why would you need to drop it, or am I misunderstanding what you think you need to do ?
    The above measurements are sort of a starting point
     
  5. tommudd

    tommudd Moderator Staff Member Moderator

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    I'm out of space every other week :happy175:
     
  6. rockdart

    rockdart Full Access Member

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    Just get it back on the ground to put the arms on might help given what you wrote. Probably be less fighting to get to the correct length for the pinion too. After the isolators go in, my height going into it will be different.
     
  7. wheeee32

    wheeee32 Full Access Member

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    What are the KJ "balls"?
     
  8. tommudd

    tommudd Moderator Staff Member Moderator

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    Vibration dampener that is mounted to the rear diff and hang down
    Sorry we all used to call them that back what now seems years ago.
    There updated for the newbies !:gr_grin::icon_razz::icon_razz:
     
  9. wheeee32

    wheeee32 Full Access Member

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    Haha!:happy175: Oh yeah! It's been a while since I've been underneath my KJ in the back. I remember thinking that when I saw them. Thank you for posting up the information Tom. I'll be holding on to it for when I finally put the tri-angulated 4 link on my KJ.
     
    Last edited: May 3, 2017
  10. mightybeet

    mightybeet Full Access Member

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    so ya can do do this will all 4 tires on the ground?... my rear is clunking and prolly need whole new rear everything.
     
  11. tommudd

    tommudd Moderator Staff Member Moderator

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    If lifted yes, well maybe not if your belly won't fit under ..................................LMAO
     
  12. mightybeet

    mightybeet Full Access Member

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    well.... crap
     
  13. krisP

    krisP Full Access Member

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    resurrecting this thread instead of starting a new one.... so without cutting any threads when the heims are bottomed out its about 19.25 center of eye to center of eye... should I cut equal amounts off each end ? maybe a dumb question.

    Another question just be cause I'm curious... does this setup put more force through the bracket since no more bushings or ball joint ?
     
  14. tommudd

    tommudd Moderator Staff Member Moderator

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    Yes equal amounts
    Not really more force, although bushings " soften " the amount and when it actually hits or you feel it
    With the bolt on its right there, solid feeling