AOD Swap Driveshaft

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1972 Mach 1
351C 4V - C6
Blue with Blue interior
Just curious if anyone knows of a place that sells either an AOD swap driveshaft for a 72 with 351C, AOD(Originally C6) and 9". Or if anyone knows the length. I have been meaning to get to the wrecker and see if I can find an AOD D/S out of another vehicle, but its far too cold to crawl under a car at the wrecker right now. Just hoping to try and either find something that works or is close to keep the cost down. 

 
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midlife

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Well, the usual way is to install the new transmission and measure between yokes to find your new drive-shaft length.  You can also compare the length of your AOD to the previous tranny to find the difference you'll need for the driveshaft. 

Relying upon other's advice for a non-descript tranny is asking for trouble.  Do it right; it's not that much more effort to find the right length, then find a shop that will shorten the drive-shaft and rebalance it. 

 

Mister 4x4

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I re-used my driveshaft with a new AOD tail shaft and 'adaptive' U-joint (one side fits the AOD, the other the stock drive shaft).  My original transmission was an FMX - roughly the same length as the AOD.  The owner of the AOD was swapping it out for a T-5 in his '89 5.0 Mustang.

https://transmissioncenter.net/shop/slip-yoke-for-c4-aod-t5-t10-transmissions-sonnax-t3-3-8251hp-forged-from-a-chromoly-billet/

I got my U-joint from O'Reilly Auto Parts... had to look up the P/N for an AOD U-joint, get the measurements, then look up the one for a '71 Mustang w/FMX, get the measurements, then find a 'Universal' joint that had both measurements.  (I lost the box with the P/N, in other words... sorry)

Everybody else says to trim the factory drive shaft about 1-1.5", but I didn't and it fits fine with no issues driving.  I would take midlife's advice and put the Mark-1 Eyeball on it to see for yourself what your car needs.

Hope that helps.

 
Joined
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1972 Mach 1
351C 4V - C6
Blue with Blue interior
Well, the usual way is to install the new transmission and measure between yokes to find your new drive-shaft length.  You can also compare the length of your AOD to the previous tranny to find the difference you'll need for the driveshaft. 

Relying upon other's advice for a non-descript tranny is asking for trouble.  Do it right; it's not that much more effort to find the right length, then find a shop that will shorten the drive-shaft and rebalance it. 
I do agree with that. Part of it was more to use to look for a used driveshaft. My understanding is it is usually cheaper to shorten a driveshaft than lengthen one, so I was hoping to get a ballpark so I dont wind up with one thats too short. I would measure but it probably wont be a little while till I put the engine and trans back in. 

 
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71 Mach 1 429CJ
Did the swap not 2 weeks ago, and aside new yoke 28 splines (which i've selected for having the same u-joint as the original one) to replace the 31, no need on changing or shortening the shaft.

 
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Joined
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1972 Mach 1
351C 4V - C6
Blue with Blue interior
Did the swap not 2 weeks ago, and aside new yoke 28 splines (which i've selected for having the same u-joint as the original one) to replace the 31, no need on changing or shortening the shaft.
Which trans did your car have? Cause looking things up I think the AOD is like 3" shorter than the C6, so it seems like I would need a longer driveshaft. 

 
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