I have also been pondering this switch on my 2000 trooper.

You should'nt have any problems as long as you have a decent size electric fan. Any time you remove something that is causing drag on your engine ( Like Cooling fan,water pump, or Power seeering pump) you sould see a minor improvement in HP and MPG.

Jegs sells electric fans that are thermasticaly controled, and some that you can control, so the level of cooling would be up to you.

P.S. Make sure you get the right type Pusher or Puller