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Old 05-25-2010, 08:22 PM   #1
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Default 2.5 to 4.0 engine swap help

I have a 93' Cherokee XJ with a 2.5L 4Cyl. engine, and I wanted to swap it out for the Jeep 4.0L Inline Six. What would I have to do to make it fit? I was hoping to just basically bolt it in, and keep the same transmission etc., and not have to change the mounts. Any info about this swap would be helpful.
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Old 05-25-2010, 08:46 PM   #2
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why? for more power? 4.0 dont have much more power than the 2.5 does, believe me ive drove both. but if u are dead set on an engine swap, i would just go all out and do a LS1/350/GCV8 swap. from what i hear the LS1 swap would be your best bet if you could find one for cheep(alot more power, better mpg)
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i'm guessing you steer clear of speed bumps lol, or your spine is made of titanium and wolverine tears
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Old 05-25-2010, 08:49 PM   #3
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I've driven a 4cyl wrangler and 6 cyl cherokee, 6 has way more power.

You will need a new engine, tranny if you dont want to blow up the light duty ones that came behind the 4 cyl, some mods to the wiring harness and I think you even need a new computer, basicvally your best bet is to buy a junked 6cyl one and swap everything over.

Basically absolutely nothing in front of the firewall is compatible.
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Old 05-25-2010, 09:27 PM   #4
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I've driven a 4cyl wrangler and 6 cyl cherokee, 6 has way more power.

You will need a new engine, tranny if you dont want to blow up the light duty ones that came behind the 4 cyl, some mods to the wiring harness and I think you even need a new computer, basicvally your best bet is to buy a junked 6cyl one and swap everything over.

Basically absolutely nothing in front of the firewall is compatible.
not starting an arguement, but most owners of wranglers put 31s on their jeep as soon as they switch tires, and most wranglers are outfitted with gearing for 225s just as the cherokees are so the power could be different than it should.

now passing power on the highway is a different story, but overall excelleration from stop is fine.....sorry off topic

what iiant says is true, alot of the parts firewall forward wont match up, but if i were you i would seriously look into a v8 swap, there are some that are just direct bolt in, just search around
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i'm guessing you steer clear of speed bumps lol, or your spine is made of titanium and wolverine tears
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Old 05-25-2010, 09:28 PM   #5
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a direct bolt in V8? Hmmmm............
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Old 05-25-2010, 09:35 PM   #6
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a direct bolt in V8? Hmmmm............

by direct bolt in i mean works with the transmission and doesnt require any modifications to fit in the engine bay...
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i'm guessing you steer clear of speed bumps lol, or your spine is made of titanium and wolverine tears
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Old 05-25-2010, 09:42 PM   #7
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I agree that a V8 will fit in the engine bay but, I wouldnt call any of them bolt in without mods to the engine bay or vehicle, i.e new motor mounts, lift to clear front axle, adapter to the trans, its definantely not someone should tackle as a first project. JMO
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Old 05-25-2010, 09:57 PM   #8
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some only requre new motor mounts and a new transfercase but of course this is only hearsay, i dont have personal experience on this matter, only word from those around me
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i'm guessing you steer clear of speed bumps lol, or your spine is made of titanium and wolverine tears
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Old 05-25-2010, 10:39 PM   #9
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the 4cyl and 6cyl manual trans are different. the input shaft is a different length. i would look into smog laws in your area so you can keep it legal if you want. a bolt-in v8 for an xj? show me.

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Old 05-26-2010, 08:29 AM   #10
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no v8 is a direct bolt in in a cherokee of any year, that is 1 of the dumbest things ive ever heard.
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Old 05-26-2010, 11:07 AM   #11
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My XJ had 31's, the TJ had 31's, same difference.


And the V8 will bolt right in... after you replace your transmission, motor mounts and just about everything else on the vehicle. Once you do all that you can bolt it right in.
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Old 05-26-2010, 11:07 AM
 
 
 
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