there is no simple sioutlon 2 ur delema. the main problem is that ur 2.4L engine is really all ur car can handle. believe it or not the car is built around the engine every thing from ur rear axle to ur tranny to ur transfer case will be a problem. these r the manditory changes u will need to make in order to swap ur engine for a 4.0 which is really not worth it. ur rear axle is at most a dana 20 or if ur lucky a dana 35, these r both what i like to call turd axles and theres no way to polish a turd. u will need a dana 44 (like the ones that came optional on the 2000 wrangler saharas). the second problem would b ur tranny, right now u have a ax-5. u would b lucky if that tranny made it more than a couple hundred miles because of the torque that the 4.0 puts out. right off of the bat u would need a beefy ax-15, they make a good combination of smooth performance. i dont know exactly what u would need to do to the transfer case but i am certain that it would need to be swapped out for a better one. save urself ALOT of hassel and just sell the 2.4 and upgrade to a 4.0.

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