4" is the magic height for tj's. Some need a sye some don't.
Does the lift come with adj control arms?
More than likely you can get by with just running a tc drop. If you do a 1" mml that should help out as well. The purpose for doing the sye and cv driveshaft is to help your driveline angles.
I say, put the lift in with a tc drop. If you get driveline vibes you'll need to do an sye and drive shaft. You should start saving up for the sye/drive shaft regardless.... some of the clearance you'll gain from the lift, you'll lose with a lowered transfer case.
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