They also made A998s and standard duty 904s in the same year, as well as factory non-lockup A999s. Which is why I need some clarification on the particular trans ID if possible.
No lockup wire plug on this transmission, just the standard 3 prong NSS (I do have a legitimate LU A999/32RH to compare it to). Many of the (non-truck) lockups were fully hydraulic and had no lockout connection (most cars would not require a tow/haul switch).