I have a 96 grand cherokee which had the same problem. When I hit a bump it would go ballistic and I would have to stop. It turned out to be a bad track bar. Changed that and the problem went away. Good luck

 

Ya biggest problem on these would be the track bar. Once lifted try to stay away from the stock trak bar and try to get the adjustable trak bar.

 

look the drive shaft over , vibrations from 35-55 are normally sprung weight

 

Please pay attention:

What I tell you is the cause of your problem, everyone else is trying to help, but just guessing. They don't understand suspension dynamics, cause and effect. I do, and I'll help you.

The wobble you get is due to the caster angle or king pin inclination being too steep. This was made worse or steeper when you lifted the front. You need to increase the caster angle to regain mid to high speed stability. With a lift to work properly you need at best longer lower control arms. This will increase the caster angle and end your problem. If you can't fit them immediately, then at least loosen your existing lower control arms at the rear and push them as far forward as possible and tighten the bolts.

I lifted my Cherokee 11 years ago, aligned it in my driveway. It wears 10.50 x 31s and it's one hand on the wheel at 85 mph, no hands on a smooth road. Never a hint of shake or any wobble ever at any speed. I have raced on the Salt Flats too and roadraced motorcycles for years. I can make vehicles go straight and secure at any speed. Not to sound arrogent, but on all forums, it seems like no one knows anything about elementry vehicle handling dynamics. It's so basic, yet everyone comes up with the same old *****, wheel balance, shocks, track bars, yada,yada...

Good Luck!

 

Hey... Thank you. Believe I posted that earlier. No one listened to me. Maybe they will listen to you :-)

 

I had a bad wobble between 47 and 52 ish mph. Turned out I had a tire that was WAY out of balance. If it is only wobbling at a specific speed range I would get your wheels balanced. $20 at Walmart

 

I've always said keep it simple, stupid.

 

Today as I was going back home I was hittin 45 and guess?? It did it again

This time it do it as bad as the first time, it really suck, and I'm getting desperate

I can try to do the caster movement but do you have pics??
I'm new at this and money is running out, I already passed the four digit number and no solution

I'm going to check it another suspension shop, see what else could it be

What I just notice is that the tie rods are a little loose, I can move them with my hand, is that normal? I mean the joints are as hard as a rock, should these be the same?? The wobble is front to back, a lot! Not up and down, also when i hit a bump turning, the way I see it I think its either the rods that are no good, or the steering stabilizer, I put out my head again and looks like that

I need to save more money for the trackbar and the steering stabilizer.

Do the sway bar links have to do something with it too? When I was removing things for the b joints I broke one of them

Tires are getting here this week, hopefully, ended with some pro comps mt, wranglers were out and I had to wait till sept - oct, what do you guys think about those?

Thank you guy for all help, just that I'm getting frustrated, I thought this was going to be a cool project, now its coming to be my nightmare

 

I had the same problem. I highly agree with jeepnick! He is right. I did a 4 inch miss and match lift on my 97 xj. Bds 4 inch add leaf, then a piece of **** used front 4 inch. That was my problem. I did the super nice jks track bar, didn't fix anything. But I did have some looseness where the track bar meets the axle. the Best fix at the time was I got the best heaviest duty steering damper I could buy. From what I remember I could then get it up to highway speeds. Which was amazing at the time! Then it got worse and came back. My patience went straight to a rubicon express front 4 inch. New upper and lower control arms, and new coils. Fixed and never have had the issue again. initial lift-weak coils, worn out control arm bushings! That I know were my problems. I would start with a cheap band aid and buy a nice damper, not a rancho! (cause their nicest one didn't make a difference). Did your new lift come with new control arms?

 

No my new lift did not come with control arms, im running the stock ones

This morning i was getting to work and it did it again, really bad, just passing 40 mph, what i notice is that the track bar where it holds to the chasis is getting loose, i started to hear a clank, so i ask a friend to move the steering and yes the bracket that holds the top of the track bar is getting loose, what does that mean?

 

As was said 3 times your castor is out and if your trac bar mount is loose you need to investigate further and fimd out where its loosening up. That is dangerous. After you try every other possible approach and end up breaking your trac bar mount or numerous other things maybe you will listen to this and learn how to fix it correctly. And you need to fix your sway bar. That is not safe either. This is turning into a death trap.

 

Yes, i do, but like i said im new at this and im bearly getting the hang of it

How can i adjust the caster? Is there a how-to?

Now you are really scaring me

 

There is a shim in the lower control ARM bracket. You most likely need to push the lower control arms forward. Short of buying new lcas you can add shims. There is a thread somewhere in either fab or tech write UPS with a template for the shims. I can't remember what the factory castor is. Anyone?? Anyhow it is measured in degrees taken off the top of the knuckle. I will try and get you more info. BTW I'm not trying to scare you and am sorry I came off like an ***. I commend you for trying and we will get you through this. The experience will help you understand suspension geometry and make you a much better mechanic.

 

here are some pictures of the suspension

just if someone sees something bad

thanks again

 

I'm a little confused about your track bar set up. Can you give a bigger pic from he front?