another 5.9 T-case swap - JeepForum.com
 
LinkBack Thread Tools
post #1 of 8 Old 08-25-2011, 08:15 AM Thread Starter
james_tessier
Registered User
 
Join Date: Nov 2009
Location: cornwall
Posts: 8
another 5.9 T-case swap

So ive been reading for about two days and im still not sure. I have a 1998 5.9, with a bad transfer case. I have a 1997 grand cherokee 4l, with a np242 i believe the select trac. Also all the driveshafts for both. I pulled the transfer case out of the 97 last night, what else do I need to put this in the 5.9. Will I need a shortened driveshaft, or what else? Theres so much to read on these subjects it gets tireing. Someone please chime in! thanks If it makes any difference this jeep will never see off-road its strictly a grocery getter.

james_tessier is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 08-25-2011, 08:59 AM
KingtheZJ
Registered User
1998 ZJ 
 
Join Date: Nov 2009
Location: Rochester NY
Posts: 2,659
i'm assuming the 249 has an internal slip yoke (isy) and the 242 has an external slip yoke (esy).

the esy is 1.5" longer than the isy. also keep in mind the d44a has a longer pinion (i think ~1" than the d35). if you have any lift in the back you should be good with the 242 shaft, but i would definitely make sure you ont bottom out the yoke as the suspension cycles.

also, if you enter your jeeps information in your profile its easier to know what to recommend.

'88 XJ
'98 ZJ on 37s and tons
'02 Chevy 2500HD 8.1
KingtheZJ is offline  
post #3 of 8 Old 08-25-2011, 09:41 AM Thread Starter
james_tessier
Registered User
 
Join Date: Nov 2009
Location: cornwall
Posts: 8
no lift

I dont have a lift in the back. Totally stock suspension and truck
james_tessier is offline  
post #4 of 8 Old 08-25-2011, 09:44 AM
KingtheZJ
Registered User
1998 ZJ 
 
Join Date: Nov 2009
Location: Rochester NY
Posts: 2,659
what slip yokes do the transfer cases have? the isy has a tailcone that goes all the way to the end of the output shaft. the esy has an exposed shaft (can see 4" pf spline) and came with a rubber boot that attaches to the yoke.

'88 XJ
'98 ZJ on 37s and tons
'02 Chevy 2500HD 8.1
KingtheZJ is offline  
post #5 of 8 Old 08-25-2011, 09:46 AM Thread Starter
james_tessier
Registered User
 
Join Date: Nov 2009
Location: cornwall
Posts: 8
the one on the 4.0 has a rubber boot i havent looked at the other yet
james_tessier is offline  
post #6 of 8 Old 08-25-2011, 10:03 AM
98BlackZJ
Registered User
1998 ZJ 
 
Join Date: Sep 2008
Location: Monticello
Posts: 314
I did the same swap on my 98' 5.2 although mine was lifted. With the parts you have you should be able to make it work. I'm pretty sure the 5.9 uses a bigger ujoint in the rear driveshaft (1330 instead of 1310) though, so if you have to use the 4.0 driveshaft you will need a conversion ujoint. I used the longer of the two driveshafts, but at stock height you may be able to use the shorter one.

98' 5.2 ltd, 4.5" lift, 33x12.50 KM2's, Clayton's longarms, 8.8/HP30 Aussie F&R
Build Thread
98BlackZJ is offline  
post #7 of 8 Old 08-25-2011, 10:08 AM Thread Starter
james_tessier
Registered User
 
Join Date: Nov 2009
Location: cornwall
Posts: 8
where do i get the number for the conversion u joint? also does anyone have the number for the seals handy.
james_tessier is offline  
post #8 of 8 Old 08-25-2011, 10:45 AM
CatSplat
Registered User
1994 ZJ 
 
Join Date: Jul 2009
Location: Calgary
Posts: 1,375
Sounds like you're converting from an internal-slip 249 to an external-slip 242. There's 3 variables that determine rear drive shaft length: TC slip yoke style, rear diff model, and transmission length.

The external slip TC is about an inch or so longer than the internal variety, so the drive shaft will need to be that much shorter. Your 4.0L had the external slip TC, but also has a D35 that is an inch or so shorter than the 5.9's D44A, so that's an approximate wash. It also has the 42RE trans that is shorter than the 46RE in your 5.9, so its rear drive shaft may actually be longer than your 5.9L's.

The only way to tell for certain is to measure after you've got the 242 installed. My guess is that neither shaft will be the correct length, and the most straightforward fix would be to have the 5.9 shaft shortened, thus avoiding the conversion U-joint needed to use the 4.0 shaft.

1994 5.9L ZJ, retrofitted UC package, NP242 swap, 17" JK Moabs with 32" BFG MT KM's.
The Jeep of Theseus
CatSplat 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









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.




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



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
zj t-case swap 93zjv8 ZJ Grand Cherokee Forum 7 03-04-2010 01:45 PM
t-case swap rustycherokee18 ZJ Grand Cherokee Forum 6 03-05-2007 09:08 AM
t-case swap joeyschribar ZJ Grand Cherokee Forum 2 03-04-2006 05:20 PM
T-Case Swap udamann ZJ Grand Cherokee Forum 4 03-04-2006 05:10 PM
NP 249 NP 242 Swap 94 ZJ 5.2 Trans Case swap / repair? smkarner ZJ Grand Cherokee Forum 1 09-27-2005 05:28 PM

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