4.0 compatability question - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-19-2014, 03:39 PM
Thread Starter
Join Date: Apr 2014
Location: Windsor, Ontario
Posts: 16
4.0 compatability question

Just curious if you could take an 02 4.0 and drop it into a 99. Along with the ecm and ignition.

Would it work or is there more involved than that?

Abscent is offline   Quote
Old 06-19-2014, 05:33 PM   #2
DoubleOught's Avatar
Join Date: Feb 2014
Location: Nashville GA
Posts: 1,209
My understanding is the 2000 and newer heads have a different port design for the intake and exhaust so probably would need to use the intake and split cast exhaust manifolds from the 02. Would required also using a front pipe off of newer TJ. Would recommend one off of a 2000 because 2000 did not have the precats (at least on the 49 state models). Not sure if the ECM is transmission specific on the earlier years or not so that might have an impact also if one is a manual and the other is an auto. Somebody on here will know.

DoubleOught is offline   Quote
Old 06-19-2014, 07:24 PM   #3
Join Date: Apr 2013
Posts: 13,017
Long block has head issues as prior poster

Short block no issue

Complete engine different sensors so different manifolds and coil packs vs distributor
Digger84 is offline   Quote
Sponsored Links
Old 06-20-2014, 09:03 AM
Thread Starter
Join Date: Apr 2014
Location: Windsor, Ontario
Posts: 16
Ok thanks for the heads up guys, I have the complete 02 jeep as a donor vehicle was just debating about picking up a rust free Arizona tj that made came up for sale near me just the engine is gone in it.
Abscent is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not 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

All times are GMT -5. The time now is 11:43 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.