Wellll - the AOD is a little bit of a different animal in the lockup dept.
The converter isn't where lockup occurs.
Rather, in an AOD, lockup, or more accurately described as direct drive, occurs in the direct clutch pack.
All that's in the converter that deals with lockup is a small inside splined hub that's mechanically attached to the front of the converter, and that's what drives the little inner input shaft which in turn drives the direct clutch pack. SO - when the direct clutch applies, you have "lockup". That's stock, so unless your trans has already been modified, you have a "lockup" setup.
The way AOD's are rendered "non-lockup" is to remove the little inner shaft and replace the hollow turbine shaft which is driven by the converter with a solid, stronger input shaft. Then with a diff VB, you have "non-lockup" in all gears incl direct & OD. In other words, the fluid drive in the converter drives all gears.
There are a raft of other things you can do to an AOD to make it stronger.
Here's some info on beefing it up to various levels of horsepower/torque capacity and abuse tolerance.
http://www.lincolnsonline.com/tech/00111.html
here's some other related info
http://www.lincolnsonline.com/tech/00080.html