Every jeep is different. I know someone that didn't get any vibes at 4.5but, someone can put on a 4.5 and vibes a alot! The 97+ seem to have vibes at a lower lift then the pre97's it seems though.
Be aware, RE lift kits usually run higher, so that 3.5 may actually be a 4.5 for awhile then settle to a 4 inch unless you have a lot of weight in it. Also with RE, the leafs are pretty stiff, making it take a long time to settle, and even then at higher then advertised heights like I said before. Most people also run a spacer with them up front, IIRC a .75 inch is perfect
With 3.5 I would get longer shocks, which are another expense. I'm getting my bilsteins soon, but they are a little pricey. You get what you pay for with shocks though, all depends on how you want it to ride.
1995 Cherokee Sport