There is a sticky that is located at the top of this particular section of NICO. I stickied it with two excellent write ups for both s13's and s14's so I wouldn't have to see threads like this come up anymore. Awesome stuff that you searched, but it was really just the 3rd thread from the top of the 240sx technical.
zerothread/187181
There it is. RB or SR or KA or whatever else you're cramming into the 40, the automatic to manual conversion stays fundamentally the same.