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Old 03-22-2008, 07:39 PM   #1
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installing the 4.0l in place of the 2.5

where do i begin??????

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Old 03-22-2008, 10:09 PM   #2
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there's been some threads lately on this. you need parts
donor vehicle is easiest, but pretty expensive. you'll need engine, obviously. junk yards can usually sell you motor and trans, with wiring harness unmutilated if you ask around. some scrap yards cut the harness up when removing. you'll need the computer, harness, engine, trans, and you have to move the motor mounts up on the frame. (cutting, and welding) thats just a start. good luck, keep posting.

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Old 03-22-2008, 11:14 PM   #3
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im new here too and ive been looking this up the best i can, i think so far if you wnat the 4.0 then find a jeep with one already in it, sounds to me likes its more expensive to make a conversion but im on limited knowledge, and budget.
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Old 03-23-2008, 09:09 AM   #4
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that is usually cheaper, and easier, but most people can't part with their current jeep.
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Old 03-23-2008, 04:48 PM   #5
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ok i did post another thread when i started this but now i've been movin on, i got a 4.0l tranny and tc with 100,000 on it, i have the computer and harness and the engine came turnkey, i had to cut the hard fuel lines at the top where it went into the 2.5's throttle body, and i had to nip the hydrolic clutch line from the resy too. now everything is gutted..
the engine will be here later on this week so that is when i am going to measure for the engine mounts. i need to know about the drive shafts and the fuel lines i cut also about the clutch lines...i thikn i can fab the cross member to work but it came out of a chearokee so i hope the harness works, and i paid 1100 for all so far, my other expense was 150 for the engine hoist from harbor frieght.i will post pics soon,but i need to know about some things if anyone can shed some light on the subject.....
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Old 03-23-2008, 06:54 PM   #6
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cherokee wiring harness might not work as good as wrangler would have. not sure about fuel pressure from a 2.5 throttle body, to a 4.0 multi port injection. might have to change fuel pump, and should be a quick disconnect fuel line going to fuel rail on new motor. can be made with special tool, probably better to find used.

i hope someone else knows about that wiring harness, i posted a thread about other harnesses connecting to under dash harness, no one answered. i think engine harness connects to dash harness, i could be mistaken.
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Old 03-24-2008, 09:00 PM   #7
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so maybe this is the best pic of the swap so far! maybe i can flinstone the jeep and it will run better than that 2.5
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Old 03-24-2008, 09:13 PM   #8
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some pics of the swap just a days work...
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Old 03-24-2008, 09:19 PM   #9
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thats all for now more on the motor mounts and engine probably next week, but any good info is welcome, stressin the fit of the engine!!!!!
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Old 03-24-2008, 10:18 PM   #10
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noice!!! good start. you'll make it fit. get a hammer
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Old 03-29-2008, 02:41 PM   #11
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ok another piece of the puzzle here is can i use the old crossmember and also can i put the new tranny and tcase in before the engine?
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Old 03-29-2008, 05:24 PM   #12
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you should be able to make crossmember work, and you can put it together any way you want, in any order. you might wanna start with trans and t-case, then you'll have a better idea of where motor mounts need to be
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Old 03-29-2008, 06:53 PM   #13
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awsome thank you very much that is what i was hoping to hear.
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Old 03-29-2008, 07:21 PM   #14
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dont worry the fit...but you guys goin threw all this trouble why not just plug a 350 into it? i'll post pics and a write up of mine. im about to start, i just finished building the motor. i'll have the TH350 trans in 7 weeks and hopefully an Atlas tranfrcase as well.
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Old 03-29-2008, 08:54 PM   #15
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i would consider that, but i'm keeping mine jeep. i'm building the stroker motor, and i love the 4.0 motor, so i'm gonna get everything out of it. this motor should cook, and be all jeep. if i did a v-8 i'd at least go 318, or 360. 350 is a great motor, one of the best of all time. it is a great swap, much support for it, parts are everywhere and cheap. not a bad option. but i don't own a chevy
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Old 03-29-2008, 09:24 PM   #16
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dont worry the fit...but you guys goin threw all this trouble why not just plug a 350 into it? i'll post pics and a write up of mine. im about to start, i just finished building the motor. i'll have the TH350 trans in 7 weeks and hopefully an Atlas tranfrcase as well.
you want this guy to wait 7 weeks for a write up?
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Old 03-30-2008, 08:23 AM   #17
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i considered a v8 but i like the all mighty 4.0. a straight piston design, in my opinion is better less moving parts but, i, like jpdocdave, want to keep my jeep "all jeep" .
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Old 03-30-2008, 08:47 AM   #18
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another issue is the rear drive shaft, it is the origianal with the tcase np231, slip yoke,
i have a 2 inch shackle lift on my jeep do i need a slip yoke eliminator or can i run how it is and also what is the point of the slip yoke??? being that my rear end will shorten up 2 inches does that mean i can keep my stock drive shaft due to the play in the tcase?
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Old 03-30-2008, 08:54 AM   #19
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another issue is the rear drive shaft, it is the origianal with the tcase np231, slip yoke,
i have a 2 inch shackle lift on my jeep do i need a slip yoke eliminator or can i run how it is and also what is the point of the slip yoke??? being that my rear end will shorten up 2 inches does that mean i can keep my stock drive shaft due to the play in the tcase?
Depends on how you do the motor mounts. If you weld in your own I'd suggest raising the motor 1" over the stock location to reduce the drive line angles in the rear. To say whether the 2" length will hurt you depends on how long the shaft is. Can you measure it from the ujoint at the case to the ujoint at the pinion?
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Old 03-30-2008, 09:29 AM   #20
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yeah i can do that as soon as the tranny and tcase come in!
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Old 03-30-2008, 12:16 PM   #21
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i hope someone else knows about that wiring harness, i posted a thread about other harnesses connecting to under dash harness, no one answered. i think engine harness connects to dash harness, i could be mistaken.[/QUOTE]

i had a cherokee harness and it was easy to hook up. you just need to hook 3 wires into the jeep one for battery one for ign. and one for ign in start. then the sensors i just used my old ones in the new motor.
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Old 03-30-2008, 12:35 PM   #22
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so you were able to use orignal dash gauges, and with three wire modification use cherokee harness? that simple? the rest plugs in to dash harness?
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Old 03-30-2008, 11:14 PM   #23
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used stock guages with stock wiring and senders. the only wires i used out of the cheroke harness (besides everything that hooks into the motor from the comp) were the 3 wires. so in other words the jeep is still all original wiring i just upluged old coil and igniter box and left it. the igniterbox wires can be removed. the old coil wires i used for ign. and ign. start for the new harness. then all i needed was to hook the power dist. block directly to the batt. the motor plugs (new harness) i left alone and i removed all the crap ie abs, air bags, auto trans, etc. works great. if my dribble is confusing let me know ill get wire colors etc. note: i used a 95 (pre obd II motor and harness) so this may be different for an obd II.
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Old 03-31-2008, 05:03 AM   #24
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man that is awsome i have been wondering how this will work out, the 4.0l i am putting in is coming from a 93 cheroke but it has an ax15 so no auto crap in the harness, but anyway if that is really it that is awseome i would love to hear the color of the wires to splice.
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Old 03-31-2008, 10:39 AM   #25
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ya, thanks for the info spazinweasel
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Old 03-31-2008, 12:05 PM   #26
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green w/ white tracer goes to fuel pump
yellow goes to starter signal
blue goes to coil (forget if its - or +)
big red wire goes to batt.
if ya need more let me know!! good luck
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Old 04-02-2008, 05:51 PM   #27
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ok so its all in today witch is awsome, it is in fairly good shape, checked out the engine and all looks good, ready to install....ohhh so excited, i don't have a 4 wheel drive shifter though so taht sucks really bad..any ideas ...maybe a junkyard visit is in order ...what do i do with the wiring for the inside dash..?????
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Old 04-02-2008, 06:17 PM   #28
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junk yard for linkage, i left the dash etc. alone just take the old wires for the old sensors and put the old sensors in the new motor and plug in the old sensor wires into the old sensors in the new motor
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Old 04-02-2008, 07:19 PM   #29
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he sounds like a kid on christmas morning
good luck keep us up to date.
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Old 04-02-2008, 07:56 PM   #30
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i know i was especially when the motor fired!!

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