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Mustang Technical Discussion > Pre 1973 > AOD Tailshaft Yoke > Community Forums > Mustang Forum Australia - Mustang Tech

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shaun071
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Hi All,
I'm gathering parts for an Aod conversion. I have a couple of Falcon V8 tailshafts lying around and found the old shaft from the AOD XD. For that conversion I used the stock XD C4 yoke and shortened the tailshaft by 1 inch. Comparing it to the Mustang C4 yoke there is a couple of inches difference in length.

Does it look short enough to work with the Mustang shaft without shortening?
The u-joint on the XD shaft doesn't have the circlips- will getting u-joints to suit be a problem? I've also got a yoke from an XB V8 shaft that uses circlips but will have to pull it out of the box to check lengths. If either of the yokes fit all I'm after is an AOD crossmember to suit a 69 coupe if anyone has one lying around.

Cheers Shaun


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hybrid
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I wouldn't be concerned about finding uni joints. I'm sure you will get them off the shelf.
Lack of circlips doesn't matter. They should just press in/out.

It's hard to say whether the yoke will work without mods. You really need to test it, because you need enough movement both in and out of the box to allow the diff to safely move up and down.

We were able to shorten the yoke on dads XD when we put the AOD in, without shortening the tailshaft, although I wasn't super keen on doing it.


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boofhead
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I have seen long yokes that often only have the engagement groves the same length as the short version so the extra length is over hang. Makes no difference if the tail shaft is the same length and the box has internal space for the extra over hang pipe.


I will someday think of something clever to say.

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hybrid
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I don't think there is usually much extra spline cut inside the box, although if the spline inner is the same diameter as the rest of the output shaft (which is sometimes the case, but can't remember with the AOD), then the yoke may be able to slide in past the spline.


Last edited by hybrid on Mon Jun 08, 2015 2:40 am; edited 1 time in total

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hybrid
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Looks like if you have a short shaft box, it's going to be pretty tight.



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boofhead
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Good pic Hybrid.

Also, just a comment, the photo of the two shafts look like the tailshafts are to short anyway. A lot of junk on the Yoke which obviously never moved inside the box passed the seal.


I will someday think of something clever to say.

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shaun071
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From memory the problem I had with the XD conversion was the splines in the yoke weren't cut deep enough, which is the reason for the excess length beyond the seal on the short yoke. I'll try and compare how far the yokes go into both boxes and try the XB yoke I have as well.


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shaun071
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boofhead wrote
Good pic Hybrid.

Also, just a comment, the photo of the two shafts look like the tailshafts are to short anyway. A lot of junk on the Yoke which obviously never moved inside the box passed the seal.


Interesting you say that Boof, I've seen 50" quoted as tailshaft length for early Mustangs and mine measures 49" centre to centre on the uni joints. Maybe it's from a different engine/box combo?
Did some measurements on the output shaft and the splined section is 100mm long- 80 internal and 20 past the seal. The XB and XD yokes are identical, 155mm long and splined right the way through. The Mustang yoke was 205mm long and the first 65mm from the nose isn't splined. I'm just wondering whether to cut the unsplined section off, leaving a 135mm fully splined yoke? I can't do a test fit yet as the diff is out at the moment.


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boofhead
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A recent T5 conversion I did resulted in approximately 20mm (close enough to 1 inch) shorter tail shaft required. There is no problem cutting the non-splined section off. I believe a T5 has the space for it not to be necessary while based on Hybrid photos your cannot keep the over hang.


I will someday think of something clever to say.

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shaun071
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Yeah looks like cutting the unsplined section is the go. There is only 10 mm extra space beyond the splines in the box.
Thanks for the info guys.


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scott66stang
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I cut the unsplined section off on my BTR auto conversion


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