JRenteria09

Basic Tune Up. Mine did the same thing. After I changed the plugs,wire,cap,and rotor, highway speeds were mine again! Also check your steering stabilizer, you may be getting some death wobble at those speeds too.

Diesel

That wouldnt cause a death wobble.

rollz4kix

When I went through all those problems, mine ended up being the steering stabilizer.

bigjustice91

Well, I do notice that I can move my steering wheel a couplw inches without affecting the course of my jeep. Would that have anything to do with it or just irrelevant? Also thanks for all the info!

bigjustice91

oh and since the motor is newly rebuilt =), everything is new. So it's not a tune up

Paco182

I've been told that 90% of Death Wobble is caused by worn Track-bar mounts (if not caused by it, could lead to it)

Other than the upper mount the bolt on the axle doesn't fit as well as it could.
The holes on the bracket welded to the axle are 7/16, the sleeve in the bushing is 3/8 and the bolt is 13/32. I drilled out the sleeve and upgraded the bolt to 7/16. Took about an hour of drilling with a constant trickle of water to keep the bushing from melting.

Both projects are fairly inexpensive and simple.

Diesel

Tie rods.

Buffalos Way

I own a shop and work on quite a lot of Jeep Cherokees. All these post are great to check. If you have done all the other things listed, then check your drive line for wear. The most common cause of torque related vibration is when the differential (Rear End) becomes misaligned with the drive shaft. There is a control arm on the top of many Cherokee Jeeps. It has a ball joint in the center that allows some flexibility in the rear differential. If that ball joint is worn it will allow the rear end to rotate against the torque of the tires as power is applied. This will create a misalignment and puts the ujoint in an excessive bind causing it to vibrate very badly and it wears the pin bearings in the ujoint as well.

Scottishrule38

My Jeep did the same thing when I hit 55mph and up. I found out it was my cardan u-joint front drive shaft. I rebuilt it and now I have zero vibrations.

jordan96xj

You are describing a grand cherokee.

jordan96xj

Based on the description, and symptoms, the #1 most likely culprit is drive shaft u-joints. Particularly those effected most during 2WD acceleration (application of torque). This means the the rear-most u-joint on the rear drive shaft is the first place to look. It does not have to be loose to the touch to be failing (it may have no play when inspected externally). Your best bet is to simply have all u-joints on the front and rear drive shafts replaced, as well as the centering yoke within the cardan joint on the front drive shaft. If this is too much, then the next best option is to entirely remove the front drive shaft to at least isolate the problem to the rear drive shaft, then at least replace both u-joints on the rear drive shaft.

If the vibration increases at 50+ when accelerating, it is almost guaranteed to be the rear drive shaft u-joints (provided that the test is being performed in 2WD).

Many of the items mentioned in previous posts would vibrate at all times even when coasting (drive shaft balance, bad tires, brake rotor balance, etc), and would not be limited to acceleration/deceleration around 55-60mph. Torque/acceleration related vibration tends to show up in drive line components that are subject to the load of the engine turning (u-joints, transmission, transfer case, differential gearing).

I have the same year, and have troubleshot and corrected the same problem.

Jim Berumen

Ok so I own a 99 WJ limited with the quadratrac all time 4WD. I've changed my front driveshaft out. It was out of balance when I installed it. I took it out then next day went and got it balanced. Told me it was 45 thousandths out of round and he got it within the tolerance which is 10 thousandths. I put it in still had a vibration so I removed the bolts cleaned them up again with a wire wheel. Reinstalled them with the loctite and torqued them down it was gone. Until a day later I'm getting what feels like a growling vibration when I get up to 60 but when I slow down to about 50 nothing. Rides like a dream no noises or anything. I've also replaced both drag link tie rods, pads and rotors all around calipers are still good plus rotated the tires that are a year old. I recently within the last two years changed the rear ball joint and both side arms to the axle. Can't think of the name off hand sorry. Could it be that I just need to replace the u-joints on the rear driveshaft? Possibly also the rear ballpoint? Really looking for some guidance here cause I'm doing this on my own since the shops around me are pricey.

EEVEE

check your u joints and shockingly enough engine and transmission mounts have a role in accel vibes too i recently discovered