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Tcase 98 zj

Old 12-29-2018, 05:49 AM
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Default Tcase 98 zj

So I have. 98 limited 5.9 with a np249 and after lifting it I have driveline vibration I'm looking at a couple np242 or np231 do they have to come out of a jeep I've found a couple in half ton dodge pick ups and a couple durangos would either of those work
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Old 12-29-2018, 09:14 AM
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The Dodge ones are slightly different, they have a different spline count, and a vacuum actuator instead of a switch for the 4x4 lights.
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Old 12-29-2018, 09:38 AM
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Originally Posted by Lifted98limited5.9 View Post
So I have. 98 limited 5.9 with a np249 and after lifting it I have driveline vibration I'm looking at a couple np242 or np231 do they have to come out of a jeep I've found a couple in half ton dodge pick ups and a couple durangos would either of those work
Your issues are not transfer case related. You can't lift a Jeep and not need things like a tcase drop or sye... depending on lift size.
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Old 12-29-2018, 11:32 PM
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I got a np242 out of a 95 grand Cherokee today. Going to pull my np249 in the morning and guessing I'll have to break them down and swap input shafts from what all I've read
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Old 12-30-2018, 08:48 AM
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Originally Posted by Lifted98limited5.9 View Post
I got a np242 out of a 95 grand Cherokee today. Going to pull my np249 in the morning and guessing I'll have to break them down and swap input shafts from what all I've read
You wont need to swap input gear, since the donor came from a ZJ. It's 23 spline, .840" input length. To do the 242 swap correctly.. use the shifter gate, linkage and bezel.
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Old 12-30-2018, 12:34 PM
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Originally Posted by OverlandZJ View Post
You wont need to swap input gear, since the donor came from a ZJ. It's 23 spline, .840" input length. To do the 242 swap correctly.. use the shifter gate, linkage and bezel.
Sweet appreciate the info. Guess if I run Into any problems Iíll be posting on here later
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Old 12-30-2018, 07:49 PM
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Well everything was going smooth till I went to put np242 would go omen easy then stop about 1/2" from the transmission housing tuns out my old tcase had splines all the way on input shaft the new one has about 1/2" at the very back where the splines stop so I'll be breaking them both down tomorrow ands swapping input ahafts
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Old 12-31-2018, 11:06 AM
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Originally Posted by Lifted98limited5.9 View Post
Well everything was going smooth till I went to put np242 would go omen easy then stop about 1/2" from the transmission housing tuns out my old tcase had splines all the way on input shaft the new one has about 1/2" at the very back where the splines stop so I'll be breaking them both down tomorrow ands swapping input ahafts
Something's not right with your donor..

Here's the info from JeepForum from the very large transfer swap thread..

93-95 V8 ZJ's: 46RH transmission, 1.55" 23 spline input shaft
93-95 I6 ZJ's with the 42RE: .840" 23 spline input (with collar)
93 I6 ZJ's with the AW4 or AX15: .750" 23 spline input
All 96-98 ZJ's: .840" 23 spline input
All 96-01 XJ's: .840" 23 spline input
92-95 XJ's: .750" 23 spline input
91 and older XJ's: .750" 21 spline input

Check this thread.. https://www.jeepforum.com/forum/f13/...-np242-685644/ See if theres something i'm missing. I now see the {with collar} on early ZJ 242's. Keep in mind, you need to match gear cut's when swapping an input into a different case.

Good luck..
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Old 12-31-2018, 11:25 AM
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Originally Posted by Lifted98limited5.9 View Post
Well everything was going smooth till I went to put np242 would go omen easy then stop about 1/2" from the transmission housing tuns out my old tcase had splines all the way on input shaft the new one has about 1/2" at the very back where the splines stop so I'll be breaking them both down tomorrow ands swapping input ahafts
Don't swap.. measure.

Figure out what is going on. Look at the tag on the tcase and check the date code.
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Old 01-01-2019, 02:27 AM
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The tag says it's a np242 j made in 93
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Old 01-01-2019, 10:02 AM
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Originally Posted by Lifted98limited5.9 View Post
The tag says it's a np242 j made in 93
That would be the issue. So yes you are going to have to swap shafts.
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Old 01-02-2019, 01:25 AM
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Yeah them both broke down shafts swapped ready to reassemble them np242 has the bigger lip and bearing so getting new bearings
In the morning and hopefully illl be back rolling tomorrow
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