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I bought a 1961 Ford unibody that has a 1976 Mustang 302 engine and 3 speed automatic transmission. I would like to replace it with a 4 speed automatic. Any help would be appreciated.
 

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The AOD is your best bet, unless you want to start messing around with electronic shift versions (there are controllers available for the AOD-E/4R70W, not sure about the A4LD). Some of these may have had lock-up torque converters, but you can just leave that unplugged if that's the case (they run off the ECM, which a '76 302 ain't got). You'll need one that has the correct bellhousing pattern, which is known as the "Late Windsor". More info in these 2 links. Cross-reference the models at the top of the 1st link with the engines in the 2nd link (right-hand column only), and if it has a 4 speed auto, it should be an AOD.

http://en.wikipedia.org/wiki/Ford_AOD_transmission
http://en.wikipedia.org/wiki/List_of_Ford_bellhousing_patterns#Later_Windsor_V8_pattern
http://en.wikipedia.org/wiki/Ford_A4LD_transmission#A4LD

More info on the AOD here, and the AOD-E/4R70W on page 3;
http://www.carcraft.com/techarticles/ccrp_0910_guide_to_automatic_overdrive_transmissions/gm_4l60e_ford_aod.html
 

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first you have to find out if both have lock-up converters. another thing you should use the torque converter that came with the 4 speed.
 
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