Leaderboard

NissanPartsDeal lists three ASCD computers that'll fit a '99 (18930-0W000, 10/'95-12/'98; 18930-1W200, 7/'97-12/'98; 18930-2W600, 12/'98-01/'00), but all three are listed for MT and AT. So, yeah, swap the auto trans shifter safety for a clutch safety and you should be golden. I'll bet pin 12 is how the ASCD tells the TCM to shift up or down. Might be straight-up commanding the TCM to shift, might just be feeding it the target speed so it can make up its own mind. I assume the ASCD doesn't expect a reply and so doesn't know/care if there's a TCM present or not. I remember someone came up with a rail shifter kit for the RE4R01A, but they were using it in a W/D21. I can only imagine how upset the VQ R50's electrical system would get if something else was controlling the slushbox.

And I didn't read through all this, but that's very awesome that it exists! I'd love to MT swap my 04, but it seems extremely difficult to even acquire all the necessary parts. MTs appeared to be far more common in Canada; donors are practically nonexistent in the US.

Looking at the 99 FSM wiring diagrams for cruise control (a.k.a., Automatic Speed Control Device, ASCD) the difference between the AT and MT isn't much. Looks like all you'd need to do is replace the Park/Neutral Position Relay with the Clutch Switch, or wire it between the Brake Switch and the Hold Relay and bypass the PNPR. Only other uncertainty is whether there were separate AT and MT ASCD modules, and whether disconnecting the AT TCM affects the signal on Pin 12. My hunch is that the modules were the same and disconnecting the TCM won't be a problem.