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Q&A > General Tech Advice > Shortening Falcon Diff > Community Forums > Mustang Forum Australia - Mustang Tech

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Shayne93
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I have the LS Diff in my NC Fairlane that I want to use in the mustang. But it is too wide.
I have another falcon diff out of an EB that I want to remove the shorter tube and axle on, and install it where the long tube goes on the fairlane diff.

I have done a search around on the net and can't find too much info, can anyone steer me in the right direction


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scott66stang
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Shortened the 2 original fairlane tubes and used the Mustang axles but machined them to take the Fairlane tapered bearings. They have the same spline , i checked this myself and was going to go this way if i decided to use it.
Even with the 2 short NC/EB tubes it is still too wide for a 65-66 and proberly a 67.


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Shayne93
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I don't have 5 stud axles, thats all. Mine had a 6 cylinder diff.
Do you have any suggestions?


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scott66stang
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Thought that may be the case, ill confirm something and get back to you if no one does before me. I did play around with XY axles etc i will go check again as it was a while ago and my memory is shite


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Shayne93
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An r31 pintara/skyline diff is 1460 mil, about what a 66 stang is.
but theyre 25 spline and I think the lane is 28. But I could get the lane axles shortened and use the lane lsd centre.

I sold one of these r31 skyline wagons for 100 bux a few years ago too.... for fuck sake! haha


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scott66stang
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housing end to housing end is around 1350 on a 66.

XY-XF diffs only the short side is right for the Mustang long tube and axle, so thats no good'
Your options are
: shorten and respline the Fairlane axles, some say that resplining isnt very strong, but if your a cruiser like me it will be plenty strong enough.

: buy aftermarket axles.

: you could fit a Centura diff a popular conversion on XL-XP V8 Conversions.... I dont know what spline the Axles have. But you might aswell just buy a Mustang one it will proberly be easier with contacts on this forum.

: Find a XL-XP ute or Van Diff they are the right length 5 stud and the Splines may be the same ill have to confirm that one by pulling an axle out of one i have here.


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Shayne93
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Do you know what the mustang diff is wheel mounting surface to wheel mounting surface (ie outside of drum to drum..)?
Because the 1460mm of the nissan diff is wheel mounting surface.


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scott66stang
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not off hand , i would have to remove the wheels to check, i only have a 67 out that i can measure. the problem with our early models is there is not much room under thr arches for error except by backspace on rims.


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Last edited by scott66stang on Mon Oct 10, 2011 4:38 am; edited 1 time in total

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Shayne93
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ohh okay, dont stress, because apparently surface to surface a 66 is 57.5 inches which is 1460.5mm in dollars and cents


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scott66stang
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If i was doing mine i would shorten and respline the Fairlane Axles or buy aftermarket. I wouldnt use my Mustang ones because i have early model Falcons i would rather use the Mustang diff on for V8 conversions.


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boofhead
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I modified a falcon 9inch for my 1970 Capri by making the Short side the long side so I only needed to cut one side of the housing. This also meant that only one axle needed to be cut and re-splined. Relatively easy job as I had the lathe back then. I did make a jig to use to help with straightening the diff housing and I used the plate from the original diff and welded to the 9. Once the end place was welded on the shortened side I used an Oxy to heat the housing and used the jig to make sure it was straight and made sure the modified end was square the the opposite original end. I assume a similar approach would work for the 66 though you would need to measure it up.


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blkpny
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Why don't you get it shortened properly? Cut and respline the axles?


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Shayne93
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blkpny wrote
Why don't you get it shortened properly? Cut and respline the axles?


The lack of professionals in this town and the cost.
I don't know of any places up here to go and speak to


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