Lockup to non-lockup question(s)

You need a physically matching convertor.
The early models were fully hydraulic, and auto shifted into od as dictated by the VB.
>The later A999s electric-shift loc-ups, came with a deeper gearset, and
>IIRC the A998s came with either ratio.
Be sure to use the shift levers off your A904, or physically matching ones, as there were several different iterations.
> IDK about the power-handling of the factory loc-up.
>IIRC the A998/A999 had those identifiers cast on the BH.