1994 YJ drivetrain swap question - JeepForum.com
 1Likes
  • 1 Post By Waternut
 
LinkBack Thread Tools
post #1 of 8 Old 05-26-2021, 11:16 AM Thread Starter
wminmi
Registered User
1990 YJ Wrangler 
 
Join Date: Aug 2020
Posts: 2
Garage
1994 YJ drivetrain swap question

Hello all -

I have a rolling chassis 1994 YJ that originally came with the 2.5 engine and 5-speed transmission.
I have a 1990 YJ donor Jeep with the 258 6-cylinder and auto transmission.

What all would I be looking at to swap the '90 258 engine and auto transmission into the '94 roller?

Pic is what I have, the black one is the donor.

Thanx in advance

Attached Thumbnails
jeeps.jpg  

2001 TJ 2.5, 5-speed
1994 YJ (roller project)
1990 Wrangler Laredo, 4.2 auto (donor)
wminmi is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 05-26-2021, 11:34 AM
Randonexplosion
Web Wheeler
 
Randonexplosion's Avatar
1988 YJ Wrangler 
 
Join Date: Sep 2010
Location: Cortez
Posts: 8,712
Several issues there but mostly its not a good idea. When I had the carbed 258 I wished I had the 2.5. At least its fuel injected.

Motor mounts need to be cut off and new welded on as well as wiring work.

It would be as much work as a 4.0 H.O. or a V8 but with disappointing results IMO

Sent from my SM-N986U using Tapatalk


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Whoever appeals to the law against his fellow man is either a fool or a coward,
whoever cannot take care of himself without that law is both.
For a wounded man shall say to his assailant "If I live I will kill you, if I die you are forgiven". Such is the rule of honor - Omerta
Randonexplosion is offline  
post #3 of 8 Old 05-26-2021, 11:44 AM
cpia84
Senior Member
 
cpia84's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2019
Location: Goldsboro
Posts: 921
Garage
First off you need to ask yourself: Are you going to keep the Jeep stock/stockish? That will determine what direction you should go with.

I am going to agree with @Randonexplosion If you are going to do a swap then either swap another 2.5 into the Jeep for an easy swap or if you want to do an upgrade go to a 4.0L HO or V8. You would also need to consider what transmission you would be upgrading to.

YJOTM: Jan 2021


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cpia84 is offline  
 
post #4 of 8 Old 05-26-2021, 12:38 PM
Randonexplosion
Web Wheeler
 
Randonexplosion's Avatar
1988 YJ Wrangler 
 
Join Date: Sep 2010
Location: Cortez
Posts: 8,712
It is also against federal law to swap an older engine into a newer vehicle, so depending on your situation with inspections etc. that could cause some issues.

Sent from my SM-N986U using Tapatalk


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Whoever appeals to the law against his fellow man is either a fool or a coward,
whoever cannot take care of himself without that law is both.
For a wounded man shall say to his assailant "If I live I will kill you, if I die you are forgiven". Such is the rule of honor - Omerta
Randonexplosion is offline  
post #5 of 8 Old 05-27-2021, 01:39 AM
SevenSlotAddict
Registered User
1990 YJ Wrangler 
 
Join Date: Mar 2021
Posts: 159
I dont know whats wrong with the black one, I assume its rusty? You may be better off reworking it using the red ones parts.
On a side note, I would be interested in left over parts, especially gauges. Shoot me a PM when you figure out what you wont reuse

Good luck!
SevenSlotAddict is offline  
post #6 of 8 Old 05-27-2021, 06:05 AM
ayelander
Registered User
 
ayelander's Avatar
1993 YJ Wrangler 
 
Join Date: Sep 2017
Location: Oak Island
Posts: 163
Garage
Quote:
Originally Posted by Randonexplosion View Post
It is also against "federal" law to swap an older engine into a newer vehicle, so depending on your situation with inspections etc. that could cause some issues.

Sent from my SM-N986U using Tapatalk
Hopefully you meant "State" law.

93 CTYJ, 350 Chevy, SM465, NP 231J TC, Ford 8.8 Rear, D30 with Chromoly, 4" RE Spring lift, 5/8" Boom, 1" body lift, 35" MT's
ayelander is online now  
post #7 of 8 Old 05-27-2021, 06:45 AM
Waternut
Registered User
 
Waternut's Avatar
1988 YJ Wrangler 
 
Join Date: Sep 2016
Location: Macon
Posts: 2,051
The engine swap law regarding swapping an older engine into a newer chassis is an EPA law. The fine is $2500 and it's all about emissions. So realistically, if you don't have emissions no one would ever know. You could swap the vin plates and comply with the EPA law but that's vin tampering and comes with a bigger fine if someone finds out. I seriously doubt anyone would know about that either but if you ever sell it, you may open up a big can of worms.

IMO, if you want the black Jeep's guts in the red Jeep, the easiest way is to swap the body. If you want the axles too, swap them as well. Boom, engine swap done in a day!
Randonexplosion likes this.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Waternut is online now  
post #8 of 8 Old 05-27-2021, 03:24 PM
Randonexplosion
Web Wheeler
 
Randonexplosion's Avatar
1988 YJ Wrangler 
 
Join Date: Sep 2010
Location: Cortez
Posts: 8,712
Quote:
Originally Posted by ayelander View Post
Hopefully you meant "State" law.
Like @Waternut said. It is an EPA thing, so its federal. Lots of guys swap in older 350s though

Sent from my SM-N986U using Tapatalk


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Whoever appeals to the law against his fellow man is either a fool or a coward,
whoever cannot take care of himself without that law is both.
For a wounded man shall say to his assailant "If I live I will kill you, if I die you are forgiven". Such is the rule of honor - Omerta
Randonexplosion is offline  
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.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome