When I had my 99 SD it had a Transcommand on it, I called Banks looking for this info and they sent me a jumper plug, just unplug the harness from the Transcommand and plug in the jumper. They didn't charge me for it, might be worth a shot.
yea i got it all done now there was 2 r/y wires from factory harness that needed to be pinned back into slots 1 and 12 and a w/y that had to be pinned back into slot 11. i was told the 2 r/y wire didnt matter what slot 1 or 12 but the w/y MUST go into slot 11.