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re-drill rear axle question

Discussion in 'The Hokey Ass Message Board' started by msinclair32, May 5, 2011.

  1. msinclair32
    Joined: Nov 11, 2008
    Posts: 133


    has anybody re-drilled a rear axle by yourself and had great success? thanks merle
  2. Yes but I have a small machine shop and can do precision work....if you're thinking about doing this by hand, I would suggest not doing that....
  3. badshifter
    Joined: Apr 28, 2006
    Posts: 3,067


    Once a week at least. Why do you ask?
  4. If you're asking this, you're second guessing your ability...might as well take it to a machine shop.
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  5. coilover
    Joined: Apr 19, 2007
    Posts: 302

    from Texas

    Yes, and they are accurate within a few thousandths. The most important thing is that the wheel center hole fits the axle pilot TIGHT. You can then put the wheel on the axle or hub and use a transfer punch that can just pass through lug hole to punch a dimple that's on center (if you hold the transfer punch straight). Here are pics of redrilling a 70 Elcamino's 4 3/4" bolt circle to accept 37 Buick 5" BC wheels. An adaptor had to be made to fit between the Elcamino's axle pilot and the much larger Buick wheel center. I made a guide tube to align first a center drill and then the size drill needed for the lug holes since I don't trust my ability to hold a transfer punch exactly straight.

    Attached Files:

  6. 6-71
    Joined: Sep 15, 2005
    Posts: 530


    Yes I have drilled several sets of 9" Ford axles to 4 3/4 chevy bolt circle. I took an old camaro brake drum,bored the center out to fit snugly over the axle pilot,then cut the drum part off to make a template.I use the same template"drill guide" to redrill the brake drums. It's not rocket science,as" they" say
  7. i have done it many times...both front drums/hubs and rear axles. i have a fixture i made to do it. if you have the right equipment and some ability it's not hard to do , if you are lacking in either it would be best to have a pro do it as others have suggested
  8. dirt t
    Joined: Mar 20, 2007
    Posts: 3,767

    dirt t
    from Kingman,AZ

    Wilson welding has a jig you can rent to drill your hubs.
  9. GAB-KC
    Joined: May 1, 2008
    Posts: 47


    Here is a pretty simple idea for a jig to re-drill axles or hubs. You just have to be able to do the precision layout for the jig. I've done the math for all of the popular combinations. The hole for the new pattern is 1/4" and you would need a 1/4" transfer punch.


  10. msinclair32
    Joined: Nov 11, 2008
    Posts: 133


    anybody got a jig like this for 4.75 to 4.250? thanks
  11. dreracecar
    Joined: Aug 27, 2009
    Posts: 2,364

    from so-cal

    The dim between studs on 4.75 is 2.792 so at mid point your transfer punch hole should be up .204
  12. porknbeaner
    Joined: Sep 12, 2003
    Posts: 38,758


    I personally like to use a rotary table or an indexing head if I have a horizontal mill. But I also have fixtures I have made from lexan that you can use a transfer punch to locate the new holes clamp the axle real good and use a drill press.
  13. Pretty freaking cool.
  14. R Frederick
    Joined: Mar 30, 2009
    Posts: 2,661

    R Frederick
    from illinois

    I have done early Bronco 9" axles from 5.5 to 4.75 with a cheap plastic bolt pattern guage and a hand drill with good results. I just eyeball center the new studs with a small bit and graduate the bits up to the size I need for the new studs. Make sure you drill small enough for the knurl on the stud to bite.
  15. Can this methods be safe if applied to volare disc rotors?
    I need to change the volare pattern to a chevy lug pattern.
    my brother is a good welder that can weld the stock holes shut but I dont know about how to get the disc surface trully flat.
    I called several shops in vegas and they dont seem to know how to do it.
    It would be best If they did it but...
  16. Here is a method I have used for years now.I do drafting and design so have access to CNC punches and laser. This allows me to drill axles in place. The plate could be made on any mill then put on axle.

    Attached Files:

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