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Gun Drilling Axles

Discussion in 'The Garage' started by TONYP, Jan 7, 2003.

  1. TONYP

    TONYP 1/2 ton status

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    Has anyone done this to there 14FF axles, I'm sending some stuff out to the gun driller and was looking for info on doing it to my axles....what size hole did you drill all the way through.....
     
  2. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    I never known it to be done but alot of the stock car guys around here do it with good reults are you breaking stock 14bolt shafts ??? if not it may be overkill /forums/images/graemlins/truck.gif
     
  3. TONYP

    TONYP 1/2 ton status

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    I can get it done free and was trying to trim as much weight off the 14FF as I can....read about it last night in the new 4x4 mag...
     
  4. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    That's cool let me know how it comes out I have the same rear and have a big block and 40" (soon to be 44" )and I might want to do the same. cool blazer /forums/images/graemlins/truck.gif
     
  5. Stickseler

    Stickseler 3/4 ton status

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    Yea I read that article last nightl...Liked that fluted 60 /forums/images/graemlins/grin.gif
     
  6. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    How do you like the trction lift in the front of your blazer I've heard mixed views on those things /forums/images/graemlins/truck.gif
     
  7. TONYP

    TONYP 1/2 ton status

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    when driving on the street it limits the movement of travel, and when I take it off road I remove the 2 pins to allow full flex on the front end,

    [​IMG]
     
  8. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    just read your post about the 14 bolt dics brakes did you have apattern or plans to make those brackets I have acces to a plasma cutter at work and could make some myself If you don't mind sharin' info /forums/images/graemlins/truck.gif
     
  9. TX Mudder

    TX Mudder 1/2 ton status

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    Guys.....if you gundrill a FF axleshaft, then gear oil will leak out all the time....
    -- Mike
     
  10. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    Only if you drill all the way through
     
  11. TONYP

    TONYP 1/2 ton status

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    my set up uses the ford calipers, i could hook you up with all the info on them, but the guys here use the chevy calipers. let me know
     
  12. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    That's fine how much are those ford calipers again and what to they come on /forums/images/graemlins/truck.gif
     
  13. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I can see the weight saving, but won't taking out the material in the center of the shafts weaken them? /forums/images/graemlins/confused.gif
     
  14. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    no actually it's suppose to make them stronger kinda like a driveshaft or a pushrod I can't explain it exactly I just know it works I wouldn't do it to loose weight your talking maybe a couple pounds per shaft I mean 6 pounds of 400 of course I think it was smokey yunick that said don't look for 1 place to lose a pound look for 16 places to lose an ounce I guess every little bit helps
     
  15. TONYP

    TONYP 1/2 ton status

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    yellow,
    I picked them up from a junk yard with the cables and bracke hoses for $55....
     
  16. TONYP

    TONYP 1/2 ton status

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    what you would be doing is making a tube out of them, a tube is a lot stronger then a solid cause you now have two surfaces that would have to bent and or twist.
     
  17. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    Okay, what year ford /forums/images/graemlins/truck.gif
     
  18. TONYP

    TONYP 1/2 ton status

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    I used ford t-bird 86-89 calipers.
     
  19. Triaged

    Triaged 1/2 ton status

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    I think I would have the OD polished before I would gun drill them.

    I still have not found anything in my strength of materials books that would lead me to believe that gun-drilling would make it stronger. It would remove a bit of weight (not much!), allow you to get a deeper heat treat because it could be heated/quenched from the inside as well as the outside, and it would lower the moment of inertia a bit. I don't think you would gain anything from just gun-drilling it.

    Most failures start on the outside of the shaft (where the stress is the greatist). If you pollished the OD it would keep microscopic cracks from turning into axle snapping shafts.

    However sence you can get it done for free DO IT!
    14FF shafts are cheep. You can be the giny pig!
    Have one shaft gun drilled and the other polished and see which one last longer.

    Don't forget to run a stripe of paint down the shaft so you can tell how much it twisted before it breaks.
     
  20. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Here's a couple of pics. I don't understand the physics of gun drilling them, but a lot of the desert trucks run these axles without problems. That's 500-700 horsepower getting thrown at these things.
    [​IMG]
    [​IMG]
     

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