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Technical New rear gears what tool???

Discussion in 'The Hokey Ass Message Board' started by mcmopar, May 25, 2017.

  1. mcmopar
    Joined: Nov 12, 2012
    Posts: 1,590

    mcmopar
    ALLIANCE MEMBER
    from Strum, wi

    6 years ago I put new gears in my jeep and a friend of mine had a special tool for measuring the pinion depth. It made the job easier than I thought it would be. Well I am going to change gears and thought I would buy the tool myself, except I don't know what it was called. Does anyone use something like this? If so where do I get one and is one better than another?
    Tony
     
  2. Joliet Jake
    Joined: Dec 6, 2007
    Posts: 493

    Joliet Jake
    Member
    from Jax, FL

  3. oj
    Joined: Jul 27, 2008
    Posts: 6,247

    oj
    Member

    Its called a pinion depth checker, they are sold in a kit form for a reasonable cost from Jegs or Summit. I found them to be less substantial and repeatability was a problem. Where you could make the same exact measure to the thousandth over and over. I would up making my own set. The kits are ok for limited use just be careful when making measurements, don't be in a hurry and constantly question yourself about the readings. The kit has instructions on how to use it.
     
    gimpyshotrods likes this.
  4. mcmopar
    Joined: Nov 12, 2012
    Posts: 1,590

    mcmopar
    ALLIANCE MEMBER
    from Strum, wi

    I have those tools already. We took the depth off of the pinion, that was written on the pinion. Then we bolted a round piece in place of the gears, and took a measurement. I believe we used it to set the crush sleeve depth, witch in turns set s the pinion.
     

  5. Crush sleeve crush does not set pinion depth, there will be shims for that, all the crush sleeve is for is to maintain bearing preload. Gives the pinion nut something to tighten against.


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    gimpyshotrods likes this.
  6. You need a depth gauge that will span across the end caps' centerline.
    You could used a bar or straight edge ,and the tail end of a vernier caliper. Then subtract the bar thickness.
    Should be able to read it within a few thou.
     
  7. sunbeam
    Joined: Oct 22, 2010
    Posts: 5,030

    sunbeam
    Member

    Its the cases that have the most variance start with the shim package from the old gears. I do not use a crush sleeve when checking pattern. Put the sleeve in after you have achieved a good pattern except for 8 and 9" Fords where the shim package is not on the pinion.
     
  8. mcmopar
    Joined: Nov 12, 2012
    Posts: 1,590

    mcmopar
    ALLIANCE MEMBER
    from Strum, wi

    That's basically what his tool did. That I can do. This is a Ford 8.8 that is getting the gear change.

     
  9. There should be a rotational torque for setting the preload, its tighten then test rotational torque then tighten some more and test some more etc.


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  10. mcmopar
    Joined: Nov 12, 2012
    Posts: 1,590

    mcmopar
    ALLIANCE MEMBER
    from Strum, wi

     

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