YJ Engine swap - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > YJ Engine swap

NEW JK WRANGLER GRAB BARS NOW at ROCKRIDGE4WDROCKRIDGE4WD Introduces a NEW Jeep Wrangler JK *led* tail Ruffstuff XJ Unirail Channel Reinforcement....

Reply
Unread 01-18-2012, 10:51 PM   #1
MrBlah
Registered User
1997 TJ Wrangler 
 
Join Date: Dec 2010
Location: Golden, Colorado
Posts: 97
YJ Engine swap

So, my buddy has a '90 YJ with the lowly and weak 4 cylinder engine. I'm tired of hearing him doing 25mph up I-70 to the Eisenhower Tunnel, so I want to replace his engine. I am looking at either a 4.0L I6 from maybe a Cherokee or a small block chevy or small block ford. Also looking at a 403 olds.

We can both weld so replacing engine mounts isn't an issue.

First, what do you guys suggest? What is easier to do? Will a 4.0L I6 from say an 89 Cherokee bolt on and fit as a direct replacement(therefore maintaining the original transmission)? Anything I do will be purchasing a core or long block and rebuilding, so performance isn't an issue with the replacement. I am more interested in the actual act of doing the swap, and want to do the least moving of other parts, like the transmission and transfer case.

MrBlah is offline   Reply With Quote Quick reply to this message
Unread 01-18-2012, 10:53 PM   #2
Ripper3494
Registered User
1994 YJ Wrangler 
 
Join Date: Jan 2010
Location: Warrenville, Illinois
Posts: 5,677
anything larger than the 4 cyl will destroy that tranny, really they're all about the same difficulty when you get down to it, id say the best balance between work and outcome would be doin a 350 sbc
__________________
build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
Ripper3494 is offline   Reply With Quote Quick reply to this message
Unread 01-18-2012, 11:10 PM   #3
Plato2k5
Registered User
1988 YJ Wrangler 
 
Join Date: Feb 2009
Location: Livonia, MI
Posts: 471
if you go other than chevy, you will spend a lot of money. I did a mopar 360 swap and it cost tons more than going chevy.... but I love saying "**** no!" to the question of "oh does that have a 350 in it?"

I like being the odd one with a non chevy engine. However, if I did another v8 swap or buggy build, I would go Ls1 or other LS series engines. Can't beat the power to cost.

I've spent a lot of money on building power with my mopar. Could of been half the cost with a chevy...but i'm happy

the trans for the chevy are cheap and you can do an OD auto very cheapy and easily, not to mention EFI
Plato2k5 is offline   Reply With Quote Quick reply to this message
Unread 01-18-2012, 11:20 PM   #4
MrBlah
Registered User
1997 TJ Wrangler 
 
Join Date: Dec 2010
Location: Golden, Colorado
Posts: 97
Well, my goal is keep try and keep it under $1000, so we'll see how that goes.

Would a 4.0L swap with a 5 speed that was designed for a 4.0L be a good choice? I know it's easy to spend just $1000 on a 350 which would leave me not much room left over for a 5 speed transmission.
MrBlah is offline   Reply With Quote Quick reply to this message
Unread 01-18-2012, 11:23 PM   #5
Ripper3494
Registered User
1994 YJ Wrangler 
 
Join Date: Jan 2010
Location: Warrenville, Illinois
Posts: 5,677
Quote:
Originally Posted by MrBlah View Post
Well, my goal is keep try and keep it under $1000, so we'll see how that goes.

Would a 4.0L swap with a 5 speed that was designed for a 4.0L be a good choice? I know it's easy to spend just $1000 on a 350 which would leave me not much room left over for a 5 speed transmission.
you wont stay under 1000 bucks. not a chance lol, between engine mounts, engine, transmission, t case, shifters, linkages, cooling, wiring harness, pcm, gauges, fuel system, intake, drive shaft modifications. going from a 4 cyl to anything else will include at minimum all of this
__________________
build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
Ripper3494 is offline   Reply With Quote Quick reply to this message
Unread 01-18-2012, 11:28 PM   #6
MrBlah
Registered User
1997 TJ Wrangler 
 
Join Date: Dec 2010
Location: Golden, Colorado
Posts: 97
If he has an AX-15 and NP-231, why should I need to change them?

I understand the need for new engine mounts, fuel system ,intake, exhaust, and cooling, but I guess my inexperience with doing an engine swap now comes into play.
MrBlah is offline   Reply With Quote Quick reply to this message
Unread 01-18-2012, 11:43 PM   #7
Ripper3494
Registered User
1994 YJ Wrangler 
 
Join Date: Jan 2010
Location: Warrenville, Illinois
Posts: 5,677
the 4cyl engine comes with the ax-5 trans which is literally the weakest trans on earth, ask me how i know, and the 231 that is behind that is weaker than the normal 231. there are 2 kinds of 231s, one kind is behind the 4 cyl and that has 21 splines, and there is one that comes behind the 6cyl which has 23 splines, from my experience the 23 splined case is far stronger than the 21
__________________
build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
Ripper3494 is offline   Reply With Quote Quick reply to this message
Unread 01-19-2012, 02:11 PM   #8
bmgadg
Registered User
1992 YJ Wrangler 
 
Join Date: Mar 2008
Location: Mississippi
Posts: 459
Going from a 4cyl to anything else means replacing the trans and transfer case, no way around it.

Chevy swaps aren't always cheaper either. An ax-15 will bolt up to a mopar v8 without any special adapters, just a junkyard bellhousing. For someone going from a 4.0 to v8, I don't see how a chevy swap could possibly be cheaper than a mopar swap.
__________________
My v8 YJ Build Thread
bmgadg is offline   Reply With Quote Quick reply to this message
Unread 01-19-2012, 04:06 PM   #9
oteps
Registered User
1980 CJ5 
 
Join Date: Jul 2007
Location: pennsylvania
Posts: 678
I did my 4.0 swap for a lot less than $1000. I bought a running xj for $600. Pulled the engine and tranny, sold the rest. Sold the yj 4 cylinder and ax5. Some 231's mated to an ax5 are 23 splines. You can use the 4 cylinder rad, and you can make the 6 cly fuel pump work in your tank. For driveshafts, you can use stock yj 6 cly shafts. I put an auto in mine so they were different.
It all depends if you can do the work yourself and how much you can get another engine and tranny for.
oteps is offline   Reply With Quote Quick reply to this message
Unread 01-19-2012, 05:37 PM   #10
attentionwhore
Registered User
1995 YJ Wrangler 
 
Join Date: Jun 2011
Location: Shippensburg, PA
Posts: 355
^^^what he said

I picked up my 4.0 motor, trans, transfer case, harness, ecu, both driveshafts for $500 for a guy at work. Once I sell the 4 cyl parts I should be up some money, not much....but some. Just keep your eyes open for deals, they ARE out there.
attentionwhore is offline   Reply With Quote Quick reply to this message
Unread 01-19-2012, 11:24 PM   #11
Ripper3494
Registered User
1994 YJ Wrangler 
 
Join Date: Jan 2010
Location: Warrenville, Illinois
Posts: 5,677
i guess i just ran into more issues than you guys did,

1000 for the 6.0
900 for fully built 4l60e
free t case
500 d shafts
200 radiator
300 linkages
100 engine mounts
200 DOM tubing to make crossmembers and wrap bar (yes even with sua)
400 for dana 44 front and rear
700 exhaust system
150 wiring harness and pcm

it can be done cheaper yes, but doing things right usually tends to be slightly more expensive. i didnt say chevy swaps were the cheapest, i just said i think they were the best balance between price, work and outcome performance

take whatever you plan to spend and add 1/3 is what everyone always told me. very rarely do things work flawlessly, there will be problems and usually problems cost money
__________________
build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
Ripper3494 is offline   Reply With Quote Quick reply to this message
Unread 01-23-2012, 12:32 PM   #12
bmgadg
Registered User
1992 YJ Wrangler 
 
Join Date: Mar 2008
Location: Mississippi
Posts: 459
Quote:
Originally Posted by Ripper3494 View Post
take whatever you plan to spend and add 1/3 is what everyone always told me. very rarely do things work flawlessly, there will be problems and usually problems cost money
Words of wisdom. There are a ton of little things that you never think about.
__________________
My v8 YJ Build Thread
bmgadg is offline   Reply With Quote Quick reply to this message
Unread 01-23-2012, 08:58 PM   #13
dodger889
Registered User
1989 YJ Wrangler 
 
Join Date: Jan 2009
Location: mi
Posts: 4,161
This is what I did I found a xj that was in bad shape body wise. Use the complete drivetrain 92 4.0 and wiring from it. Yes including TC. Installed and SYE kit. Used the front driveshaft from the xj had it re-sized to fit for the YJ rear shaft. Since you have a fuel pump in the tank already that will work. There should be no reason to rebuild the motor unless it is well past the 150k mile mark or it has some strange sounds. You may just replace the bearings and change the oil pump. Now I did change the water pump to a yj style pump. That was so I could still use a stock fan setup. depend on what year the YJ is and if it is cable driven speedo you might need and cable with electronic speedo unit. Here is something to since it is a 4 banger then you will have more than likely 4.10 gears which will give him all the gearing he should need unless again he has 33 or larger tires. Now I know what I spent doing my swap was close to about 1500. You could get by with a little less or more depending on what it cost for getting XJ for and what you can recover back out of the left over parts.
__________________
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
dodger889 is offline   Reply With Quote Quick reply to this message
Unread 01-23-2012, 09:01 PM   #14
czjeeper
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2006
Location: Washougal, WA
Posts: 1,506
My Dodge 5.2 swap wasn't terribly expensive.
Dakota bellhousing to the AX15/231 was $50 from the junk yard. Conversion radiator was about $200 from Oconee. Novak mounts about $150. Dodge 5.2 clutch kit at the parts store. $400 for complete 5.2/harness/PCM.
Also, all the gauges work w/the Dodge powertrain.
The rest was just hard work for the most part.
__________________
US Army combat vet
2011 Grand Cherokee Laredo 3.6
Armed Forces Jeeps Member #125
Red Jeep Club Member #251

In the Portland/Vancouver area? Check 'em out! Piston's Wild Motorsports Club

Click here for 2.5L AX5 to AX15 swap
czjeeper is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.