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99 4.0 into 96 xj

99XJeeper

NAXJA Forum User
Location
middletown CT
i found a 96 xj that needs a bottom end and have a complete 99 4.0 in my garage. what would be required to get the 99 4.0 running with the 96 system? were there any major changes that would make this swap difficult? some people say to swap the intake manifold and sensors from the 96 onto the 99.
 
If you are keeping your '96 computer then you have to use the '96 sensors, injectors, and the other electronic parts that the computer controls. Best thing to do is open two browser windows on autozone or somewhere and compare part numbers to see what is the same and what is different.

Other than that you can use the donor engine as-is. Sometimes you have to swap the throttle bodies but they are the same for '96 and '99. The steering pumps and belt routing are the same too.
 
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