try the full stage 2 rebuild. mines getting done atm.
insted of just the valve body its clutch packs, bands, O-rings. what ever comes out gets upgraded good for 350-400kw and under 2k
but for a non turbo .... just sell it and buy a manual one. , it will cost more then the auto, but you will save the labour $$$ and time and bullshit in converting it to manual ...