500-comanche Posted October 7, 2011 Share Posted October 7, 2011 Ok guys, I need a little help with my memory. It looks like I will be resurecting the MJ after all. It's an 89 that needs a new engine. It has an AX-15 and is 4x4. If I wanted to go to a HO 4.0L do I need to watch out for one that was matched up with a 5spd? What would need to change if it was an engine out of an xj with an AT? I used to be pretty well versed in this stuff, but I guess after 2 yrs and a new born baby my memory is shot. Thanks Link to comment Share on other sites More sharing options...
cracker Posted October 7, 2011 Share Posted October 7, 2011 The motors don't care if it is mated to an auto or a manual. The motors are the same (although the throttle body can vary between an auto or a manual). An HO would require you to rewire your whole vehicle for it. Link to comment Share on other sites More sharing options...
Pete M Posted October 8, 2011 Share Posted October 8, 2011 what's wrong with the current engine? Link to comment Share on other sites More sharing options...
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