i believe scott had to get a new ecm when he did the 4.0 swap in his yj. the donor cherokee had the anti theft system built into it.
cheapest way is tot get an ecm without the antitheft in it, or more expensively, get the ecm you have reprogrammed. no way to 'wire around' it as far as i know.
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover with a 6.0 LSx
1994 YJ, 4.3/700R4/OME SOA, etc
Western Star 4900EX 4 axle.
4.3/700r4/new frame buildup (YJ)....