Since the only thing that changed here is the tires.

I would swap them front to rear (temporarily) just to eliminate the tires that are on the front end as a possible cause.

You bought used tires, perhaps that's why the PO sold them/got rid of them in the first place.

 

I had a 95 with a very similar lift, running on 31s... Had the same DW, replaced the steering stabilizer, and it helped but never cured the problem... I had little faith in the aftermarket stabilizer, the "white no-name" wasnt nearly as good as the oem one...

 

Just FYI, replacing the stabilizer doesn't "fix" the problem, it just masked the symptoms.

 

Hey I'm a teenager with no money, masking the symptoms is what I do best! hahahaha

 

Oh... Thats right, Jeep was just masking out of the factory.... Because shocks dont wear out??

 

bad tire
seperation?

 

My '99 has no mods but I have experienced the condition you described. It wasn't as bad as the dreaded DW, as it was specific to 60 +/-5mph. The condition was more pronounced when running on wider tires. While swapping back to my skinnier (winter) tires last week I determined (actually found by accident) there was a bad hub/bearing in the right front. With the hub replaced, I restored the wider tires in exact last-used position (marked when stored) then drove for three days. No more 60mph wobble!

A couple of lessons learned: (1) Clean the greasy/mud wads out from the inner side of the rims, because they act like wheel balance weights, then re-balance any wheels where significant wads were found. (2) Your best tire treads should always be mounted to the rear wheels, to help keep your ***-end from passing you by. This rule is true regardless of whether a car has rear- or wrong-wheel drive. (3) Ply separation becomes more prevalent as tire pressures increase (jack-hammer sensation increases as tire temperature/pressure increases).

 

Umm, actually the first part of your statement is correct. Stabilizers are intended to dampen (mask) minor vibrations. Remove one from an XJ with a healthy steering and suspension system and you'd notice only an annoying vibration, NOT Death Wobble.

And for what its worth, I'm siding with others here that think this isn't true DW, but a bad vibration caused by a bum tire or two.

 

i would lift the front end and check the steering stabilizer, i replace alot of stabilizers on jeeps at work for wobble issues. usually wranglers. but most the time the tires are balanced fine and the alignment is fine. try to stick with OE, most aftermarket is cheap and not made in america.