There's one part of my question about donor vehicles that never got answered. Does it mater if the donor is 2WD or 4WD? I see inputs to the ECU labeled 4WD, 4L, and TFN (transfer case neutral). Why would the ECU need these signals (ABS brakes possibly or are these only needed by automatic transmissions)? Would an ARB referee care? Would I care? Are the 4L and TFN signals available from a RF1A transfer case?
