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2014 Summit 5.7
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3,937 Posts
First issue is the trans are not the same. In 2014 the 3.6 uses the 8-spd 845RE and the 5.7 and 6.4 use the 8-spd 8HP70. The 8HP70 handles more power so even if it fit probably not a good idea to put a 5.7 let alone a 6.4 on an 845RE.
 

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Registered
2014 Summit 5.7
Joined
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3,937 Posts
hmm well off top of my head I think radiator different 3.6 has a lower cooling capacity than 5.7.. I think gears are different in rear between the two. probably going to be a lot of rabbit holes to run down with a change like that. I haven't pulled an engine on this jeep so I dont know exactly everything maybe someone will respond who can tell you the deeper detail but I think if cost is an issue things will probably add up quickly. Good luck
 
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