98 ZJ Frontend Question - JeepForum.com

 
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post #1 of 3 Old 04-29-2013, 12:04 PM Thread Starter
Grand98
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1998 ZJ 
 
Join Date: Apr 2013
Location: Chesterfield
Posts: 91
98 ZJ Frontend Question

Ok. This question has probably been answered before, but I wasn't sure where to look. Here's the issue. I got a 98 ZJ with 33x12.50 Truxxus tires and 6.5" lift. I didn't really have any major vibrations or wobble before in the frontend, but I just replaced both motor mounts and rotated the tires. Now, between 40 and 50 mph, it vibrates like hell almost like there's a tire out of balance or a tire is seperating. Could this be the case? Or is this the dreaded Death Wobble? Or could it be the driveshaft vibrating? It still has the factory cv to u-joint driveshaft. This is my first Jeep and I'm a noob to this. Any faster or slower than 40 and 50 and the problem is gone. A little help or insight guys. Thanks

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post #2 of 3 Old 04-29-2013, 01:03 PM
speedbucket
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1993 ZJ 
 
Join Date: Jan 2011
Location: chesapeake
Posts: 3,562
at 6.5" you should be on longarms, if your not then thats your biggest problem
also if you have the cv at the front diff pinion instead of a ujoint then that is probably it, they get toasted by anything more than 2" of lift
THat requires a yoke swap which can be somewhat detailed depending on your mechanical skills, you cant just unbolt it and slap a u joint yoke on
rotate the tires back one at a time and see iff it changes

http://www.jeepforum.com/forum/f22/speedbuckets-zj-build-1361322/
V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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post #3 of 3 Old 04-29-2013, 03:41 PM Thread Starter
Grand98
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1998 ZJ 
 
Join Date: Apr 2013
Location: Chesterfield
Posts: 91
I bought the Jeep recently with the lift on it and it currently does not have the long arms. But I do have the long arms for the rear and the control arm drop kit from RRO that I'm about to install. What confuses me is that before I did the motor mounts and tire rotation, I didn't really have an issue at all. Just every once in a while.
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