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| Matt_jew |
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I honestly didnt know there was a disc brake option.
The yanks are a long way ahead of us hey. Maybe an australian setup could be made to fit. Mod the mounting brackets if required with out touching the diff housing then its just trying to sort out the different wheel bearings. What is a Marti report? I ahve heard it a few times and owned an american car but have never actually seen one.
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| sooty72 |
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The '69 should use the same track width as XR-XY, as Matt said, but remember the springs are going to be XR-XY width as well, meaning they are closer together than the XA-XH/E-series wagon leaf spring mounts. If you can use the wider diff, you will still have to move the spring mounting plates on the axle tubes. If you try and fit the later model diff to the earlier model springs without moving the mounts, it will eventually bend the diff housing. Not fun, and will get messy real quick.
I reckon you will be better of building a whole new rear end, with a new housing, e-series axle tubes, new mounts, E-series brakes, new billet axles, and a new centre with 3.00:1 (or maybe 3.25:1). Just put the 3.9/drum brake rear end aside for later, etc. If you can source the bits yourself, and just have to pay for axles, and labour, it will come in relatively cheap. And by using E-series rear brakes, there cheap to fix/replace, you can use the original mustang handbrake lever, plus it's stuff you already know. Just my thoughts. 
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| Papa Smurf |
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Ash, I remember years ago that there were Disc Brake kits for 9" diffs.
Take a look at this page and see if that would interest you? http://www.fordracingparts.com/parts/pa ... ield=11789 |
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| fairlane6970 |
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Ash I knew a guy in the Fairlane club a few years ago that swore that ea rear discs and calipers were a straight up bolt-on for 9" ers he even gave me a set of them to try (which I haven't
 ) he swore blind his neighbour had them on his V8 cortina, but most people don't seem to think they do. I know RRS also make a rear disc conversion but seems most kits need bigger wheels than 15".
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| fairlane6970 |
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have I still got them? ha! ha! I got every piece of crap I ever had - somewhere
 Still got 'em no problems we could do that.
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| fairlane6970 |
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Yeah thank god for eBay! Still have a few XY radios stashed away!
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| brendonnash |
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I have converted the 9" in my Firebird to disc brakes.It was a pretty easy conversion.
I used XF Falcon calipers, brackets & backing plates. They should bolt straight upto the Mustang with minimal machining . The mounting brackets needed drilling in my application to mount them at the front of the discs to miss the shocks. |
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| sooty72 |
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IIRC, EA-ED use the same rear (disc) brakes as XF, do they not? If not the same, they look very similar, and might be easier/cheaper to find.....
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| fairlane6970 |
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Correct me if I'm wrong (I'm sure they will lol!) aren't XF ventillated whereas EA are solid? I'd go XF for the win.
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| fairlane6970 |
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Just found these pics of a XF conversion on a nine inch that was on fleebay many moons ago thought I'd post them FYI
Attachment: discrear1.JPG [ 21.11 KiB | Viewed 553 times ] Attachment: discrear2.JPG [ 18.01 KiB | Viewed 576 times ] Attachment: discrear3.JPG [ 16.19 KiB | Viewed 383 times ] Attachment: discrear4.JPG [ 19.47 KiB | Viewed 362 times ] Attachment: discrear5.JPG [ 13.19 KiB | Viewed 523 times ]
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| fairlane6970 |
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Nice conversion - that's probably why I've kept them, always wanted rear dics on the ZD as you never seem to see a XY / ZD with them!
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