You can put a 3.7 up to a 2011 in your '02 - HOWEVER, the only way to do it is just as tjkj2002 said. You have to swap the cam sprocket and the reluctor ring on the end of the crank. The EGR also needs to be blocked.
Here's an overview: http://www.jeepkj.com/forum/f202/eng...verview-53270/
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2003 Renegade, Black
- 3.7L, 42RLE, 4.10's, 4X Guard Trans skid, Factory Engine, T-case, Tank skids, Modded BoulderBars sliders, OME 927/948, Bilsteins, JBA A-Arms & 1/4" top plate, 1 extra rear iso/side, Moabs with Firestone Destination AT's 255/70-16