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i am building a ford and it has a 3spd in it now will the aod bolt up to it if so which one i dont do alot of fords but this 67 half ton has a built 352 and it needs an over drive for the highway.
 

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AOD to 352

The 352 is an FE Block and they were out of production before the AOD's came in, so none of the current belhousings will bolt up to it. The only thing I could recommend would be to check with a Ford Specialist out fit and see if anyone makes an adaptor plate for you to use. Another alternative would be if you have any friends that are good machinists, to see if they could fabricate an adaptor plate for you.
The alternative would be, if you dont mind driving a stick transmisssion, would be to find the 3 speed overdrive transmission used in Ford pickups in the late 70's and early 80's.
This transmission is a single rail, enclosed shift unit that is a modified version of the Ford Toploader. They have an aluminum case and shift just like a 4 speed, with the OD being where 4th gear would normally be.

These are a pretty fair transmission, and will be a bolt in job, providing you arent runnning 4 wheel drive.

The only thing I extra I would do, if you locate one, would be to get the front drive shaft yoke as well. I dont know if the standard 3 speed used the same splines on the slider yoke as the 4 speed or not. You may well have to have your driveshaft either shortened or lengthened, depending on your current transmission.
 
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