My 92 Dakota has a 518 with the electronic OD, and hydraulic lockup.

It also has a Mopar Performance 2200 RPM converter.

It works great, and lock up functions correctly. It will cruise at 70mph and be at 2200 RPM. I get 17mpg out of the 5.2 Magnum.

As for the 518's with no lockup I know for sure that the early (92-93) diesel and V10 trucks had the non-lockup 518. It uses a standard 727 converter. Thats what I used with an Ultra Bell in my 93 Ramcharger with the 440.

PATC sells an easy to use kit that used pressure switches, and a vacuum switch to control the OD and lockup if required.

Easy to use, and you dont have to constantly push buttons, or flip switches.