Well AOD, that's a rather broad term honestly. What do you want? Can it be electronic? What's your end goal HP wise, will this ever see the strip/track? What kind of tires will you be running?
Overall the "easiest" way to get the goodness of overdrive is to install a AOD box to a Turbo 350 or Turbo 400. That'll just mean grabbing your trans of choice, installing it, hooking up the box behind it, and then a custom driveshaft.
Gear Vendors under/overdrive transmissions the most awarded auxiliary transmissions.
Those guys make arguably the best setup available, for many different transmissions.
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23:23] blkIROC355: sometimes when i pee i make that sound the light sabers make
[23:23] SpecialK LS1: lmao
[23:23] blkIROC355: and play with the stream
[23:23] SpecialK LS1: that's just wrong