I just did the exact same lift on a 2003 TJ or should I say I had it done for me about a month ago
The aim was to be able to use the several sets of wheels & tyres remaining from my previous Ram 1500 ownership's.
I had a set of 5x4.5" - 5x5.5" 1" custom adapters made by (wheelspacers.ca) Chilliwack, BC, Canada.
The install went relatively smoothly and we did a full tyre balance and alignment at the same time.
I ended up with a great looking rig I couldn't drive over 72 km/h (~45mph) as we had developed the infamous death wobble.
In all the research I did while waiting for my shorts to be cleaned it seemed like this was not uncommon and the cure was not too painful.
First suspect was wheel balancing, the trackbar, then caster.
Since we had already done the balancing the next thing we did was re-check the install and re-torque all the bolts.
In consultation with the Zone guys (who were great) we ended up replacing the track bar and then the caster adjustment bolts.
Apparently when a solid axle vehicle is lifted the front wheels "fall backwards" something to do with the geometry after we replaced the track bar the improvement was amazing but I could "recreate" the death wobble in one very peculiar circumstance; there is a hill in the town where i live that has a sweeping off camber left handed corner if I hit the brake pedal hard at a certain point in the corner the wobble would reappear. After this we adjusted the camber to bring the front wheels forward by 2 degrees.
I have been driving it now for about a month and have had no sign of the wobble since.
It was a stressful situation, I was terrified I had a undriveable jeep or I was going to have to take out a second mortgage, I was freaking. Having said that my mechanic shop and the Zone guys were great and never showed any signs of abandoning me or throwing their hands in the air.
It was a few extra dollars I had not expected to have to spend but who is to know whether those parts were worn and ready to be replaced anyhow.
From not being a Jeeper it was an amazing learning experience, I sure got familiar with suspension terminology and hardware
Conclusion, I would still do it again YES in a heartbeat.
Would I have been better off buying 5x4.5 wheels and the appropriate tyres, Yeah but the cost would have been greater if I wanted 3 sets - off road, winter, highway.
All in all a deep end into into being a Jeep owner.
To the O/P I wouldn't be concerned too much, be thorough, doublecheck everything, enjoy
If you need anymore info post or PM me
Cheers,
Geoff
P.S. sorry its a bit long winded but I wanted to be accurate