I have 3 98's one for parts two being rebuilt. The one of them I'm redoing didn't come with the key fob I have tried to reprogram the fob that came with the parts one but it hasn't worked so I was wondering if any knew if you could take the control unit out of one and plug it in to the other one and have it work

 

The key fob is programmed to the green alarm box which is under the passenger side dash.

Some people have had luck switching out alarm boxes, but sometimes that box and the GEMS ECU are synced.

Best bet is to swap out the alarm box and the ECU. We always sell them as a mated pair.