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Unread 02-01-2013, 08:05 AM   #1
TheMayo
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1997 TJ Wrangler 
 
Join Date: Jan 2013
Location: north miami beach, Florida
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4.0 swap questions

All of this information is listed somewhere im sure........ I have been googling different things to try and get some answers but its all very scattered and pieced together information i would rather just have mine answered directly if possible...

I have a TJ with a 2.5 manual trans. I want to do the whole 4.0 swap (please dont recommend a v8 lol) i found a 91 cherokee 4x4 with a 5 speed 4.0... Would i be able to use the motor/tranny/transfer case from this vehicle WITHOUT manipulating any brackets or whatnot? and when changing the transmission do i need the driveshafts frim the 4.0 as well or will my same driveshafts work?

Also would i be able to use the wire harness computer from the cherokee?

Thanks guys, i know it might have been 'cheaper' to have just bought a TJ with a 4.0 but i got my TJ for a steal

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Unread 02-01-2013, 08:19 AM   #2
inkryptic
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Most people will tell you that if a 4.0 is really what you want, sell the 2.5 and buy a 4.0. It'll be cheaper and easier. For the expense of the engine swap, you might as well just get the V8. You can get a less popular or powerful one with lots of community support and the cost involved for the swap, while more than the 4.0, is not as difficult to swallow.

The 97 used the same ax-5 five speed as the 91 Cherokee, and I think the same NP231 xfer case, too. The spline count is probably different so you will need to get that case from the 91.

Do some searches. There is a lot of info out there. Some additional things you will need:
- Computer
- Wiring harness
- Radiator/fan
- Motor mounts (they are in a different position, so the old ones will need to be removed, frame groudn smooth and painted, new ones welded on, etc.
- Exhaust (downpipes are different, probably need cat-forward at least.
- new gearing

When you start realizing that you have to source and buy all of these same exact things for a v8 swap, you realize why people say what they do.
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Unread 02-01-2013, 08:27 AM   #3
TheMayo
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Not saying v8 requires more money or effort, i just want the 4.0... I know i will need the computer and wire harness, my question was can i use the computer and wire harness from the cherokee?

Exhaust? thats fine the current exhaust on the car is obnoxious.
I want to go aluminum radiator/electric fan also so that covers that.
Motor Mounts i would like to hear more about? from every 4.0 swap thread i have seen none mention motor mounts
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Unread 02-01-2013, 10:33 AM   #4
DirtRider1357
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not saying to do the v8 swap. but with my old yj i swapped from a 4.2 to a 4.0 and still regret not going v8. cost would have been the same.
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Unread 02-01-2013, 11:04 AM   #5
joe108
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Anything is possible given enough time money and effort, but as stated above, much cheaper and much easier to just sell the 4cyl jeep and buy one with a 4.0
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Unread 02-01-2013, 11:06 AM   #6
SightlierDuke23
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Not saying that a v-8 swap wouldn't be the way to go, but some people have reasons for why they are choosing certain swaps/replacements. I'm not sure what the laws are in Florida,but, different states have different laws, for example, if you live in a state that has strict emission regulations that require inspections every year you are limited to certain things. If the OP lived in north carolina where i live his Engine would have to be same year or newer being that it is a 97, which is required to be hooked up to the states database and tells evertyhing about your vehicle, so switching to a v8 is like switching your head with your neighbors. Not saying it can't be done,but the hoops you would have to jump through would be rediculous. I'm not sure if that is why the op wanted a 4.0 or not, but i would agree with INKRYPTIC, sell it and buy a jeep with a 4.0
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Unread 02-03-2013, 02:26 PM   #7
TheMayo
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i live in florida, i have done several motor swaps to my previous mustang and a good friend of mine can do anything so im sure the both of us can get it done with a $0 labor cost, local junk yards have crashed cherokees with intact 4.0s with 5spd tranny and transfer case available for around 500 bucks. so unless i can find a v8 that everyone speaks of with a tranny and transfer case for around $500 bucks i dont see it being the same price range...

im looking forward to doing this swap and i plan to do it over the next month or 2.. im pretty closed minded to any other options like selling for another or going v8, i really just want to know what i can and cant use from the cherokee 4x4 for this swap.

biggest issue raised is news to me, would i need to simply buy '97 wrangler mounts? or do i have to have something welded?
would i be able to use the cherokee computer and wire harness without modification? or do i have to get that from a '97 wrangler?
also would i be able to use the driveshafts on the car? if not do i need '97 wrangler driveshafts or can i get them from the cherokee as well?

^if i can have the answers to these questions i will have the swap done with no surprises for a very reasonable price.
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Unread 02-03-2013, 04:22 PM   #8
sduncan
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Quote:
Originally Posted by TheMayo View Post
i live in florida, i have done several motor swaps to my previous mustang and a good friend of mine can do anything so im sure the both of us can get it done with a $0 labor cost, local junk yards have crashed cherokees with intact 4.0s with 5spd tranny and transfer case available for around 500 bucks. so unless i can find a v8 that everyone speaks of with a tranny and transfer case for around $500 bucks i dont see it being the same price range...

im looking forward to doing this swap and i plan to do it over the next month or 2.. im pretty closed minded to any other options like selling for another or going v8, i really just want to know what i can and cant use from the cherokee 4x4 for this swap.

biggest issue raised is news to me, would i need to simply buy '97 wrangler mounts? or do i have to have something welded?
You will have to remove the 4cyl mounts and weld on new mounts.
would i be able to use the cherokee computer and wire harness without modification? or do i have to get that from a '97 wrangler?
If you try to use the XJ harness you will need to mod it. They are not the same.
also would i be able to use the driveshafts on the car? if not do i need '97 wrangler driveshafts or can i get them from the cherokee as well?
If your rig is stock then you MAY get away with this...I wouldn't bet the farm on it though..

^if i can have the answers to these questions i will have the swap done with no surprises for a very reasonable price.
Good Luck
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Unread 02-03-2013, 09:51 PM   #9
TheMayo
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Quote:
Originally Posted by sduncan View Post
Good Luck
thank you sir.

The jeep has a 6 inch lift (if that matters) and a ford 8.8 rear end.

the only v8 swap that sits in the back of my mind is a ford 351, found motor, tranny and transfer case on craigslist for a grand and it keeps popping into my head, but im really looking forward to an i6 swap
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Unread 02-06-2013, 04:21 PM   #10
inkryptic
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Not sure what your emissions laws are but keep in mind that if you put a new ODBII computer in, the VIN that is pulled by the emissions guys will say it's a cherokee or whatever the donor was.

Also not sure of your inspection laws, but some states say you must get an engine the same year or newer than the one you are replacing. If that's the case by you, just make sure they aren't very thorough on that... they'll look the same to the naked eye.

No Surprises? You ARE optimistic!
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Unread 02-06-2013, 08:06 PM   #11
TheMayo
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Location: north miami beach, Florida
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Quote:
Originally Posted by inkryptic View Post
Not sure what your emissions laws are but keep in mind that if you put a new ODBII computer in, the VIN that is pulled by the emissions guys will say it's a cherokee or whatever the donor was.

Also not sure of your inspection laws, but some states say you must get an engine the same year or newer than the one you are replacing. If that's the case by you, just make sure they aren't very thorough on that... they'll look the same to the naked eye.

No Surprises? You ARE optimistic!
lol yeah i havent heard of any of those things, i have lived in florida my whole life. those emissions things sounds ridiculous im sorry for the people that have to go through all of that!

and thanks, im very optomistic. the motor mounts shouldnt be a problem because my neighbor welds. my donor car will probably be a 91 cherokee 4x4, still not sure if the wire harness from that car will work with a 97 computer?
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Unread Today, 08:49 AM   #12
TJolt
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Anyone know if I swap a Cherokee motor of same year or newer into my 2001 TJ Wrangler if it would be a direct swap or would I need to do some mods
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Unread Today, 08:58 AM   #13
biffgnar
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Quote:
Originally Posted by TJolt View Post
Anyone know if I swap a Cherokee motor of same year or newer into my 2001 TJ Wrangler if it would be a direct swap or would I need to do some mods
An XJ? Well, 2001 was the last year of XJs so I guess that gives you 1 year to look at. I believe it can be done (with enough work almost anything can be), but its not simple. For example, which transmission do you have? Would you swap over the XJ transmission? Would you be able to get the full XJ PCM and harness? Would you be able to get all the accessories also (as I believe they mount differently in an XJ)?
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