4.2 to 4.0 engine swap question - 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 > 4.2 to 4.0 engine swap question

Black Friday Sale!!FS: Jeep Fog Light LED Bulbs! Several Brightness Options! Introducing MONSTALINER™ UV Permanent DIY Roll On Bed Line

Reply
Unread 12-05-2010, 12:57 PM   #1
dmack3501
Registered User
1988 YJ Wrangler 
 
Join Date: Nov 2010
Location: Noblesville, IN
Posts: 8
4.2 to 4.0 engine swap question

Need some advice!

I just swapped out my 4.2/TF-999/NP231 with a 4.0HO/AW4/NP231 on a 1988 YJ.

I seem to have too much angle on the rear drive shaft (it does connect & spin w/out binding) and the front drive shaft is a little too short as well.

Basically, it seems like the new setup is about 3" longer than the original.

Has anyone ever ran in to this before?

Am I just overlooking something simple?

Any input wuld be greatly appreciated!!!!

DMACK

dmack3501 is offline   Reply With Quote Quick reply to this message
Unread 09-05-2011, 11:31 AM   #2
speedbump94
Registered User
1988 YJ Wrangler 
 
Join Date: Jul 2010
Location: plano, Tx
Posts: 49
i have an 88 yj also, what year was the 4.0 that you swapped in. i am trying to do the same thong.
__________________
/l ,[____],
|-- -L--[]lllllll[]-
()_)-()_)==O=)_)
speedbump94 is offline   Reply With Quote Quick reply to this message
Unread 09-05-2011, 11:36 AM   #3
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
Do you have a lift kit?

You probably need a sye kit
__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 09-05-2011, 11:37 AM   #4
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
Both of you should look at my build thread about the 4.0 and aw4 swap
__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 09-05-2011, 03:30 PM   #5
bsakal
Registered User
1988 YJ Wrangler 
 
Join Date: Nov 2006
Location: King of Prussia, Pa
Posts: 118
I did a similar swap, although I installed an AX15 instead of an AW4. I bought new shafts, it was cheaper than having them made. The front shaft was too short. I installed a SYE in the T/C, and bought a Tom Woods rear shaft from Quadratec.
__________________
'88 YJ 4.0 AX15 NP231; '97 ZJ; '69 Charger SE 383; '66 Newport 383
bsakal is offline   Reply With Quote Quick reply to this message
Reply

Tags
4.0 , 4.2 , driveshaft , swap , YJ

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.