What year 4.0's can I swap into my 1994 Wrangler? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-11-2011, 11:27 PM   #1
Join Date: Jun 2011
Location: Palm Beach County Florida
Posts: 7
What year 4.0's can I swap into my 1994 Wrangler?


New forum member here. I've owned 2 YJ's in the past (both 4.2's) and just picked up a 1994 4.0 5 speed Wrangler. Well, the "misfire" in the motor turned out to be a bunch of collapsed lifters due to a suspect oil pump.

Instead of rebuilding it seems like the best course of action is to find another running Jeep to scavenge the motor from. I am thinking a 4.0 Cherokee or Grand Cherokee is the way to go.

What year motors can I use for this? I want to do a direct swap without headaches. I do not want to get any sort of odd ball or performance upgrade; I just want to get plug and play and get back on the road for the summer.

I assume the latest motor I can get is a 1995? Is that correct? What is the earliest 4.0 motor I can go with? Anything to watch out for on certain years?

1988 - 1995, or should I look for a 1991 and up?

Also, does it make a difference what transmission is in the donor vehicle in terms of plopping it into my Wrangler?


JrodNJ is offline   Quote Quick Reply
Old 06-12-2011, 07:32 PM   #2
Join Date: Jun 2011
Location: Palm Beach County Florida
Posts: 7
Bump for the Sunday Night crew; 91-95 seems the way to go?

JrodNJ is offline   Quote Quick Reply
Old 06-16-2011, 01:16 AM   #3
banks316's Avatar
Join Date: Apr 2011
Location: Longview, WA
Posts: 2,089
Any 4.0 should work either out of a yj or xj. Just make sure that if you have a high output you replace it with a high output . Same goes with a non high output.
93 YJ I6 5spd
My YJ Build +1.5 inch SOA ,37 12.50 15R Swamper M16's, 5.22:1/2.97:1 Stak Tcase with 92 Crawl Ratio--------SOLD...
banks316 is offline   Quote Quick Reply
Old 06-16-2011, 09:11 AM   #4

WF Supporting Member
crafty's Avatar
Join Date: Dec 2006
Location: Clearwater, FL
Posts: 1,670
I have a 93 on it's 3rd engine now. First replacement was a 96 Cherokee 4.0 and the new one is from a 99 TJ. No newer than a 99 will work without some extra headache.

You will need to change the pilot bearing which can be a pain when you swap engines.
Female rolling with the 93 YJ SOA Locked and Hard at Play
crafty is offline   Quote Quick Reply
Old 06-16-2011, 10:30 PM   #5
Leans93's Avatar
Join Date: May 2011
Posts: 22
For sure you want 91 and up as they are the HO motors. The 90 and older are Renix and not the same motor. Also you can pull one from a YJ XJ or ZJ as I know 91-95 the long blocks are identical. Also it doesn't matter what tranny is behind it.
Leans93 is offline   Quote Quick Reply

Quick Reply

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


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

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
98 wrangler 2.5 4.0 swap jeremy chambon General Jeep Discussion 3 09-17-2010 10:25 PM
NEEDED ECM 1994 Wrangler 2.5L 5 Speed UNLIMITLESS Classifieds Archive 1 10-29-2009 09:47 AM
1994 Wrangler, need help naming a part to order new one. tua80867 General Jeep Discussion 12 05-18-2008 11:57 AM
1989 wrangler efi swap? hurricane145 YJ Tech Forum 1 03-05-2008 03:49 PM
1994 Wrangler 55k miles 4x4 trade for Dirt Bike / ATV OR $5500 94JEEP4X4SALE Classifieds Archive 2 02-17-2007 09:22 AM

» Featured Product

All times are GMT -5. The time now is 10:10 PM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC