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Unread 11-01-2011, 12:40 PM   #1
bigbill888
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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?

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Unread 11-01-2011, 12:45 PM   #2
somebody5788
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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.
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Unread 11-01-2011, 12:46 PM   #3
PolkaPower
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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+.
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Unread 11-02-2011, 08:55 AM   #4
bigbill888
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On board diagnostics plays a role in the function of the transmission??
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96 ZJ Laredo, 4.0, 242, 230K
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98 XJ Sport, 4.0, 231, 140K
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Unread 11-02-2011, 10:46 AM   #5
leadfootny
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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.
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Unread 11-02-2011, 05:08 PM   #6
JrMechanic
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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.
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Unread 11-02-2011, 06:02 PM   #7
neonhomer
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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.
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Unread 11-02-2011, 09:41 PM   #8
SouthSeaPirate
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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.
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Unread 11-02-2011, 10:34 PM   #9
ratmonkey
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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.
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Unread 02-26-2013, 07:47 PM   #10
wyldcdn
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so what 42re's swap with the 98's directly then?
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Unread 02-27-2013, 08:51 AM   #11
ajmorell
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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.
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