14-02-2021, 12:52 PM
/Welcome
I've no idea if it has ever been done.
There were changes to the W5A51 through the life of the VR4, with changes to the TCU as well. I'm not sure if anyone fully understands all the differences though, because if you put a late model gearbox into an early model car it doesn't work properly, even if you swap the TCU that matches the gearbox.
The W5A51 was also used on the Evolution VII GTA, so may be that is another route to investigate?