I believe the R154 is for the Turbo and the W version is for the non turbo.
I think someone did an auto to manual in the forums.. will see if I can find the thread.
I think this is the one, although I think there is an older one I couldnt find...
http://www.toyota-supra.info/forums/...anny-swap.html
and from long ago
http://www.toyota-supra.info/forums/...to-manual.html
and.. I think this is the one I was thinking of...
http://www.toyota-supra.info/forums/...onversion.html