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Unread 01-04-2014, 08:58 AM   #1
ElHefe2000
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1998 ZJ 
 
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T-case issue?? Help please!

I've searched for awhile & couldn't find an answer to this so here goes...I've got a '98 ZJ V8, 5.2L engine. My front tires won't spin, while the back ones do. Essentially I've got a 2wd Jeep Does this sound like a t-case problem or something else. Please help if you can.

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Unread 01-04-2014, 09:12 AM   #2
mudruna
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I could be wrong, but it sounds like the viscous coupler in your transfer case is shot. I'm not an expert on the inner workings of the NP249 but I'm sure others will chime in on the details of the fix, I think there is even an link in the FAQ section at the top of this board talking about it.
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Unread 01-04-2014, 09:36 AM   #3
pageman
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while in 4 hi do figure 8's in a parking lot with the jeep fully warmed up like 15miles and if the front end hops and cirps and kicks its a bad vc, if it doesent the we can move on to other things that might be your problem. if the t case is alrigt the only thing that i think it could be would be a 100% broken ring and pinion. the d shaft movs but the pinion is broken it wont transfer any power
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Unread 01-04-2014, 12:42 PM   #4
ElHefe2000
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Ok so I went & did some figure 8's no chirping, so I guess I can rule out the VC.
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Unread 01-04-2014, 12:56 PM   #5
Scopez
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So you can hold the brake and just spin the rear tires with the front shaft in and it's in 4 all time? Definitely sounds like a tcase issue. It should be sending power to the front if the rear slips.
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Unread 01-04-2014, 01:13 PM   #6
durango-bob
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It still could be a front axle issue or a tcase issue. Can you jack it up with all the wheels off the ground and let it idle in gear. Then you can see if the front wheels are getting any torque by trying to hold one of them. It is a good idea to have a helper work the brake while you do this.
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Unread 01-04-2014, 08:09 PM   #7
ElHefe2000
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Quote:
Originally Posted by Scopez View Post
Definitely sounds like a tcase issue. It should be sending power to the front if the rear slips.

Yeah, it's full time 4WD or supposed to be now it's RWD. That's what I thought! I dunno I need to find a friend with a lift.
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Unread 01-04-2014, 08:13 PM   #8
dharroald
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Have you checked to make sure you have a driveshaft in the front...
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Unread 01-04-2014, 10:51 PM   #9
Scopez
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Quote:
Originally Posted by ElHefe2000
Yeah, it's full time 4WD or supposed to be now it's RWD. That's what I thought! I dunno I need to find a friend with a lift.
If you haven't checked the obvious and don't have a front shaft, I have one that'll fit your ZJ.
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Unread 01-05-2014, 11:44 AM   #10
ElHefe2000
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Drive shaft is still there.
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Unread 01-05-2014, 09:16 PM   #11
Compgeek789
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Wait... Mine chirps and bumps and all that good stuff while I'm turning sharp! Does that mean I potentially have a bad viscous coupler?
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Unread 01-05-2014, 10:09 PM   #12
Scopez
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Quote:
Originally Posted by Compgeek789 View Post
Wait... Mine chirps and bumps and all that good stuff while I'm turning sharp! Does that mean I potentially have a bad viscous coupler?


If you have the NP249 and your over 130k miles, then yes.
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Unread 01-05-2014, 11:53 PM   #13
970001zj
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mine hops , chirps/squeals tires , groans low at 30 in the front and rear then higher and louder at 40 , whines at cruise , vibrates really hard in the rearend at 50 and creaks about 15 times from the rear if i turn the wheel and give it gas

does that mean i need a new driveshaft ?
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Unread 01-06-2014, 05:03 AM   #14
Compgeek789
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Quote:
Originally Posted by 970001zj View Post
mine hops , chirps/squeals tires , groans low at 30 in the front and rear then higher and louder at 40 , whines at cruise , vibrates really hard in the rearend at 50 and creaks about 15 times from the rear if i turn the wheel and give it gas

does that mean i need a new driveshaft ?
Sounds like a combination of issues, but mostly the driveshaft. I used to get growling and vibrations from a bad front shaft. To be sure it is the driveshaft, park on a flat surface, put the e brake on, get underneath the vehicle and try turning and rattling the driveshaft. If it has a lot of play and/or rattles, then you have bad joints in the shaft. Do this for both shafts.
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Unread 01-06-2014, 06:46 AM   #15
JasonStebbins
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Quote:
Originally Posted by ElHefe2000 View Post
Drive shaft is still there.
Even with a bad VC it should still send power to the front tires. Have you tried putting it in neutral and shifting back and fourth a few times from 4hi to 4lo while coasting slowly? Otherwise it sounds like a TC issue.

Quote:
Originally Posted by 970001zj View Post
mine hops , chirps/squeals tires , groans low at 30 in the front and rear then higher and louder at 40 , whines at cruise , vibrates really hard in the rearend at 50 and creaks about 15 times from the rear if i turn the wheel and give it gas

does that mean i need a new driveshaft ?
Sounds like bad bearings in one of the differentials, bad U-joints and a bad VC.
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