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Axle spline extention

Discussion in 'The Hokey Ass Message Board' started by mcbay, Sep 8, 2012.

  1. mcbay
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    mcbay
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    Any thoughts on extending axle spines an additional .50 inch to keep from having to have new axles made. These appear to be broached as the outside dia is slightly larger than the base diameter.
    Thanks.................
  2. 36-3window
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    36-3window Member

    how would you add to them?
  3. 36-3window
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    36-3window Member

    ok...i thought he wanted to add to the length of the axle
  4. RichFox
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    RichFox
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    In 1980 I and another guy shortened a 9 inch Ford axle by setting it up in a mill with an indexing head and using a single point tool in a flycutter. Picked up the existing splines and cut them back about 4 inches. Then cut off the excess. As I remember we had to turn the axle to the correct dia. Axle is still in the car and has gone 208 mph. It was pretty hard steel.
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  5. terry48435
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    terry48435 Member

    You'd have to anneal them first as they are case hardened. A machine shop would have to cut the splines and then you'd have to reharden them.I used to work at Ford Sterling axle plant and that's how they're done at the factory in the repair department.
  6. midnightoilgarage
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    midnightoilgarage Member

    shouldnt be a problem.have them resplined.
  7. RichFox
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    Yes and I did not anneal or reheat treat the axle. Right now the axle and car are in Melbourne and as far as I know doing fine
  8. Dolmetsch
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    Dolmetsch Member

    I tried this for something to do. I made a jig of sorts but not too scientific. I used an old diff to index the splines and did the flycutter deal one at a time. It is workable but my tool bit wasnt up to the job. But that was the only problem. Its on my NEW FED thread. I decided to buy aftermarkets for this project anyway since I will need them if the motor works at all like it should.
    Recently I was intrigued by the idea of making a holder for the axle. Welding some pipe to an old side gear, heating the axle to almost yellow. Sliding the rigged up side gear over the glowing axle and pounding it down quickly with a sledge hammer. When the axle cools the side gear deal should slide right off the newly minted splines. Probably a dumb idea but it occurred to me it might work. However I have too much going on to bother right now and even if I did I would still have a not-approved axle so it is probably pointless for this build. Rocky reworked the splines in his new trans input for the Evil Twin by hand.
    Don
  9. H.G. Wells
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    H.G. Wells Member

  10. nick_c
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    nick_c Member

    I don't know if this is true but I was told that axles that could be resplined had to be shortened a minimum of 3-4 inches.
    But if it's larger past the splines I don't see why you couldent unless it's a problem with the alinement of new and old splines.
  11. big duece
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    big duece Member

    I thought the ford oem rolled or knurled their splines, and the aftermarket companies like moser cut their spines. I wonder if you could match a machine cut to an existing knurled spline?
  12. Bib Overalls
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    If the splines have an outside diameter that is larger than the axle shaft you are SOL.

    Also Moser will not respline an axle if they have to cut in the hardened area.
  13. oldguard
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    I think there is a tool for that in the ACME/Warner Brothers Prop Book...
    Beep ....beep!
  14. SIX_94Y
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    SIX_94Y Member

    Made a diff for my 62 falcon daily used bits and peices but had to shorten an axle 3" that weekend! So I could be driving again on monday. Cut a thin slither of the spline off and cut the axle to length, tack welded the slither onto the end and cut straight splines using the slither as a spacing guide with a 1.0mm thick cutting wheel. Then V'd each groove with the same angle grinder with the 1.0mm disk. Once done cut the slither off. The od where this was done was slightly smaller so I was a little worried. Been in the car for a few years now no prob with a manual and silly driving. Dont recommend it but shows how much you can get away with.....


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  15. racemad55
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    racemad55 Member

    I did one on a 12 spline 3/4 ton axle for my frankland q/c,needed about 1/2" more so I could cut off 1/2" off the end. No problem for a machinist with the right equipment.
  16. mcbay
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    mcbay
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    Thanks guys, these are 28 spline Ford truck axles. I need to get a little more spline on the axle not additional length.
    They look rolled as the OD where the splines is slightly larger. Not sure who could do this that would be cost effective. After I cut these down I can tell if they will let the bearings seat fully in the housing. I did not measure the internal spline depth on the side gear but it was not very long.. under an inch.
    These are going in a Halibrand V8 QC. The bitch is the offset has been adjusted for Buick drums and 49 Lincoln backing plates and rings welded to the flanges and machined to center the Buick drums. So I hate to scrap em!:(
  17. prewarcars4me
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    prewarcars4me Member

    Maybe alter the axle housing to match? Enough room?
  18. 55willys
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    55willys Member


    splines can be cut in the axle in the hard surface without annealing. the depth of the spline can be done in the hard area with the right cutter
  19. coilover
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    coilover Member

    Just went through something similar. The Auburn limited slip for the Dana 44 has some units that the splines in the axle side gears in the differential are not cut deep enough for the stock axles to slide into. I sent the axles to Moser and they cut the splines to the size of the wrongly machined Auburn axle gears. It was only 0.008 so didn't weaken the axles much. Yes, they cut them cold no matter where on the axle. To be fair Auburn offered my money back and to pay for shipping but I didn't have time for them to sort out the problem at the factory so sent the axles to Moser.
  20. Scumdog
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    Scumdog Member

    Narrowed my housing then used the short axle as the new 'long' axle

    And resplined the original long one to suit and cut it to length as the 'short' axle.

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