42RE transmission compatibility? - JeepForum.com

 
LinkBack Thread Tools
post #1 of 11 Old 11-01-2011, 11:40 AM Thread Starter
bigbill888
Registered User
1996 ZJ 
 
Join Date: Nov 2009
Location: michigan
Posts: 969
42RE transmission compatibility?

I have a 95 ZJ Limited with a bad 42re trans. Will a 42re from a 99 WJ Laredo work in it without a bunch of cobbling?


96 ZJ Laredo, 4.0, 242, 230K
95 ZJ Limited, 4.0, 242, 140K
98 XJ Sport, 4.0, 231, 140K
All work well
bigbill888 is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 11-01-2011, 11:45 AM
somebody5788
Registered User
1994 ZJ 
 
Join Date: Aug 2008
Location: Warsaw
Posts: 1,127
Quote:
Originally Posted by bigbill888 View Post
I have a 95 ZJ Limited with a bad 42re trans. Will a 42re from a 99 WJ Laredo work in it without a bunch of cobbling?
The WJ transmission feels spongy and never really feels like it's grabbing in any gears. It doesn't feel anything like my ZJ's 42re which tells me the changes are fairly significant.

2006 Honda 919 - Summer Daily
1994 Jeep ZJ - RC Long Arms | RE 4.5" springs | Bilstein 5100's | RE SS brake lines | Falken 31x10.5-15 tires | Flatland 4x4 bumpers | Summit Soft 8's 15x8 3.75 BS wheels
somebody5788 is offline  
post #3 of 11 Old 11-01-2011, 11:46 AM
PolkaPower
Registered User
1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss
Posts: 19,421
Not likely. OBD1 on the 95 and OBD2 on the 99. A lot of things are different between the 93-95, 96-98, and 99+.
PolkaPower is offline  
post #4 of 11 Old 11-02-2011, 07:55 AM Thread Starter
bigbill888
Registered User
1996 ZJ 
 
Join Date: Nov 2009
Location: michigan
Posts: 969
On board diagnostics plays a role in the function of the transmission??

96 ZJ Laredo, 4.0, 242, 230K
95 ZJ Limited, 4.0, 242, 140K
98 XJ Sport, 4.0, 231, 140K
All work well
bigbill888 is offline  
post #5 of 11 Old 11-02-2011, 09:46 AM
leadfootny
Registered User
1996 ZJ 
 
Join Date: Feb 2005
Location: Oswego, NY
Posts: 476
Yes, since the ecm and tcm are one unit. I believe that you have to use a 93-95 tranny otherwise the comp won't know how to control it.
leadfootny is offline  
post #6 of 11 Old 11-02-2011, 04:08 PM
JrMechanic
Registered User
1993 ZJ 
 
Join Date: Oct 2008
Location: Lima, Ohio
Posts: 3,370
OBD I vs OBD II have nothing to do with the 42re, it's the same transmission from 93-98 with few changes. I do not believe a WJ transmission will work though.

Want to swap an NP242 or NP231 into your ZJ? Here's how:
http://www.jeepforum.com/forum/f13/n...pdated-685644/
JrMechanic is offline  
post #7 of 11 Old 11-02-2011, 05:02 PM
neonhomer
Registered User
1996 ZJ 
 
Join Date: Sep 2010
Location: Edgewater, FL
Posts: 471
Why do you say your tranny is bad? A lot of 42RE problems can be solved with replacing the pressure sensor and solenoid....

Anyway, the OBD-I vehicles had a TCM to control the 42RE.... A 99 WJ I think used the 45RFE.... You need a ZJ tranny.

RockAuto says for the 1999 Grand Cherokee Laredo 4.0L is a 45RFE....

Any ZJ with a 4.0 should have a 42RE... Some had the AW4, but they are VERY obvious differences between the two.. (look at the tranny pan).

If you feel brave and adventurous, try rebuilding the trans you have. They are fairly easy if you can read, use tools, and have a good set of snap ring pliers... The only thing you need a specialty tool for is the OD section. The direct pack is under 900lbs of spring pressure, and requires a special tool and a press to compress the pack to remove the snap ring. Upon reassembly, you need an alignment tool to keep the internals lined up.

Me and a friend of mine rebuilt my 42RE in an afternoon. (Three days total... pull one day, rebuild one day, install one day). New torque converter, new clutches, new steels, new seals, and new solenoids.... About $350 total parts... and I had to replace a couple of thrust bearings and I optioned to replace the direct spring.

---------------
NeonHomer
Mid-Florida Jeep Club - Member
1996 Jeep Grand Cherokee, 4.0L/42RE/242 - Rebuilt motor w/ Comp cam (4/12), 3.5" Junkyard F>R lift, 31x10.5.x15 M/T's, Spartan Locked D44a, TC & tank skids, F&R adj trackbars, V8 steering arms
Galaxy DX99V CB, 102" SS Whip, Yaesu FT-2900R 2m, Larsen 1/4w mag mount, Sony HU, Massive 3way - F Door, Pioneer 3way - R Doors, MB Quart ONX304 Subs (x2), Lanzar 1600w amp.

"No Matter Where You Go... There You Are."
"Oh me oh my a lovely day is dawning. Oh what a joy I didn't wake up dead. So I can go to work and then resume my yawning, and get my sleep on site instead of in my bed" - Daria Morgendorffer (with my twist)
neonhomer is offline  
post #8 of 11 Old 11-02-2011, 08:41 PM
SouthSeaPirate
Registered User
2001 XJ Cherokee 
 
Join Date: May 2008
Location: Florida
Posts: 692
You can use a tranny from a 93 to a 98. I'm currently running one from a 96 in my 94. Note; some 93 ZJ's have a different auto. Easiest way is to compare the transmission pans. The 93's I refer to look incredibly different, so it could easily be spotted in the JYard. Sounds as though you may already have one lined up, but there is a reason you cant use a 99+. I cant remember right off hand, but Ill look and see if I can figure out what it was.

Edit: Seems its the sensors and connectors that are different. Other than that, they are pretty much the same. If you cant change them, I wouldn't know. Maybe someone else can chime in.
SouthSeaPirate is offline  
post #9 of 11 Old 11-02-2011, 09:34 PM
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Posts: 19,793
There were valve body changes asd well a sensor and connector changes through the years.keep it to the zj1 years.
The wj used the 42re with the i6 & (5)45rfe with the v8. Your rock auto foo is weak.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

ratmonkey is offline  
post #10 of 11 Old 02-26-2013, 06:47 PM
wyldcdn
Registered User
2003 TJ Wrangler 
 
Join Date: May 2010
Location: Biloxi
Posts: 25
so what 42re's swap with the 98's directly then?
wyldcdn is offline  
post #11 of 11 Old 02-27-2013, 07:51 AM
ajmorell
Registered User
 
ajmorell's Avatar
 
Join Date: Jan 2006
Location: Santa Fe
Posts: 7,144
Quote:
Originally Posted by wyldcdn View Post
so what 42re's swap with the 98's directly then?
Quote:
Originally Posted by JrMechanic View Post
OBD I vs OBD II have nothing to do with the 42re, it's the same transmission from 93-98 with few changes. I do not believe a WJ transmission will work though.
ajmorell 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
Transmission Compatibility TheAngus ZJ Grand Cherokee Forum 5 09-19-2007 02:30 PM
42RE Transmission. Calamity ZJ Grand Cherokee Forum 2 01-04-2006 07:45 PM
42re Transmission??? 92cherokeesport ZJ Grand Cherokee Forum 9 12-27-2005 11:00 PM
42re transmission bikemanj7 ZJ Grand Cherokee Forum 19 10-31-2005 05:26 AM
Transmission 42RE DuneCrawler ZJ Grand Cherokee Forum 3 07-02-2004 11:50 AM

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