a904 problem

Stage 3 is full manual right?
In the previous combo;
you had to block the governor circuit with a tiny cup plug. So now the trans has no way of knowing what the roadspeed is and the VB has no way of commanding the shift. So you gotta tell it when to shift ..... by Moving the shifter.
But if you forgot to transfer the cup plug,to the current trans, and intend to keep the Full Manual feature;
well then the governor is gonna try and run the show. In which case the governor flyweight has to be matched to the rear end ratio. and the VB has to be put back into Stage 2.
But if you want to keep it as a Stage 3, then you gotta go get that cup-plug, or procure a replacement.