Many Dodge and Jeep vehicles could be ordered with the factory alarm, mostly Durangos 98-2000 and Grand Cherokees 96-01 but there are a few Rams and Dakotas with factory alarm. Its easy to figure out if they have it. As far as SKIM, othe wise known as security key, most Dakota RT's have it, 98-03, Durangos and Grand Cherokees with convenience package 75-85% of them by my estimation. This system does not use a thumb print key, it is a RF transmitter embedded in the plastic key fob(grey in color instead of black) that transmits a signal to the receiver located next to ignition switch which in turn compares key codes to match ones stored in PCM. If it gets correct code, it allows pcm to send ASD relay latching signal. If it doesn't get correct/no signal, it will fire and die.