The factory radio does not have an aux Jack.
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It has a drivers side airbag only.
A 1998 Jeep Cherokee has disc brakes in the front.
I do not believe there is such a thing as a tcu. there is an ECM (engine control module), and a TPS (throttle positioning sensor) TCU: Transmission Control Unit. On a Jeep Cherokee (not sure about the Grand Cherokee), it's located on the passenger side behind the dash. You can reach it from the bottom without removing anything, but it is easier of you remove the bottom of the dash.
Will bolt up, but will not shift. The 1998 is controlled differently by the computer.
I have a 1998 Sport and have several times gotten the low fuel light. Never actually have run out of gas and I have driven up to about 15 miles with the light on.