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Jeep Wrangler JK
JK General Discussion
JK 3.8 swap to a 4.0 how to?
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<blockquote data-quote="JerryD" data-source="post: 452085" data-attributes="member: 17662"><p>The most economical/least frustrating/least time fix would be another 3.8. I agree that the reason most(any?) don't do a 4.0 swap is because of mating the canbus controlled everything to the JK. I suppose you could replace gauges with mechanical and get a "Universal" harness from some place like Painless Performance or something. The downside of doing that, depending on where you live, is putting an older engine in a newer vehicle could cause problems getting it registered/inspected (there are often legal ways around this, though). And the cost to go to a Hemi or LS can get very pricey, very quick.</p><p></p><p> If he's looking for better performance, a fresh 3.8 and a re-gear could be a good route. Shoot, you could even throw a RIPP supercharger on it if you wanted more power. IMO, getting another 3.8 is the fastest, cheapest, easiest way to get it back on the road. </p><p></p><p>I really miss my old CJ & it's 4.2. Loved the exhaust note of the straight six...</p></blockquote><p></p>
[QUOTE="JerryD, post: 452085, member: 17662"] The most economical/least frustrating/least time fix would be another 3.8. I agree that the reason most(any?) don't do a 4.0 swap is because of mating the canbus controlled everything to the JK. I suppose you could replace gauges with mechanical and get a "Universal" harness from some place like Painless Performance or something. The downside of doing that, depending on where you live, is putting an older engine in a newer vehicle could cause problems getting it registered/inspected (there are often legal ways around this, though). And the cost to go to a Hemi or LS can get very pricey, very quick. If he's looking for better performance, a fresh 3.8 and a re-gear could be a good route. Shoot, you could even throw a RIPP supercharger on it if you wanted more power. IMO, getting another 3.8 is the fastest, cheapest, easiest way to get it back on the road. I really miss my old CJ & it's 4.2. Loved the exhaust note of the straight six... [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
JK 3.8 swap to a 4.0 how to?
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