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Old 11-02-2010, 10:23 PM   #1
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transfercase question

I have a 1999 wrangler 4.0 5sp with a broken transfercase and want to know if a cherokee transfercase is the same.
mine is a 231j 272 ratio

thank you

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Old 11-02-2010, 10:29 PM   #2
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Same...Yes...and no.

Depends on the year.

What is "broken" in or on your t-case?

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Old 11-02-2010, 10:34 PM   #3
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My front case has been cracked but i have not opened it up yet to see what else is broke. I can get a 1999 cherokee tcase for 150$
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Old 11-02-2010, 10:45 PM   #4
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Well good news...the front housing is the same.

The "TJ" has a different tail housing than the XJ/ZJ/MJ 231 /// as it allows you to remove the rear driveshaft without loosing fluid.

Also will depend on the spline count on the 231j you found. Your t-case has a 23 spline input shaft and many of the cherokees have a 21 spline count.
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Old 11-02-2010, 10:51 PM   #5
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My t-case tag reads
model 231j
ratio 272

The cherokee reads the same except the ass'y number is different does that give you any more info
thank you
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Old 11-02-2010, 10:58 PM   #6
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All the tag is for is the model and ratio.
231...style type of t-case
j....Jeep
272... is the internal ratio.
There is probally 20 or so versions of a NP231 t-case. They are used in Jeep chevy and dodges. but the housings and input/outputs are different.
The cherokee's tail shaft is slightly different from your TJ's. But CAN still be used with a little know how and modding.
The spline count can be different and many cherokees have a 21 spline count.

Your NP231j in your 99 wrangler with a AX-15,5speed has a 23 spline input shaft.
Check the cherokees spline count. if 21..no go...but you can use the front housing. If 23spline...yes but you will have to do a little modding to get the rear tail shaft to fit the driveshaft.
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Old 11-02-2010, 11:16 PM   #7
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Your help is greatly appreciate
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Old 11-02-2010, 11:18 PM   #8
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No worries bud, if you have anymore questions let us know bud.
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Old 11-03-2010, 05:43 AM   #9
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The 4cyl Tj's come with a 21 spline input shaft also.
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Old 11-28-2011, 07:57 AM   #10
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Quote:
Originally Posted by jeepjones View Post
The 4cyl Tj's come with a 21 spline input shaft also.
Can anybody confirm this? I've been searching the internet and so for I have not seen this anywhere else.

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Old 11-28-2011, 10:05 AM   #11
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Can anybody confirm this? I've been searching the internet and so for I have not seen this anywhere else.

I believe the manuals do but the automatics don't; at least mine didn't. It has the 23 spline input shaft just like the 6 cylinder models. Keep in mind you also need to worry not only the spline count but the input shaft length. You can find varying information online about what the length/spline should be for certain t-cases, but I've found it can vary quite a bit. The best way to be sure is to find out exactly what spline count/shaft length you have and find something that matches up exactly. Or you can take the case apart and swap input shafts.

EDIT:

Some more somewhat useful information:

http://www.novak-adapt.com/knowledge...nput_gears.htm
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Old 11-28-2011, 10:25 AM   #12
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Go check out the JB conversions website. They have case halves fairly cheap.

Edit: http://www.jbconversions.com/index2.php?pc=1

They have everything you could possibly need.

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