Do 3.5-4" lifts require a SYE?

I have a 4" RC lift. After I seen the angle I opted to grab a sye kit. And just in case you are, don't be intimidated at all with it. Super easy set up.

Don't forget at a minimum you will need upper rear adjustable control arms to dial in the pinion angle
 
Don't forget at a minimum you will need upper rear adjustable control arms to dial in the pinion angle

I just bought the 4" RC kit. It came with everything needed. I'm not hard core with my jeep. Just moderate off roading. I bought it stock and just wanted it for a little off road fun.
 
Don't forget at a minimum you will need upper rear adjustable control arms to dial in the pinion angle

But going to upgrade a couple of things in the steering as I have the f'n death wobble now. I think I'll start with the Crown Automotive RT21004. I think this is a good starting point? I'm no expert in this so just doing some searching.
 
Mine is an LJ so a little different. RC 4 inch springs. No vibes but I hate looking at those square tube transfer case drop spacers. Driving 3 hours one way Friday to buy a low low mile 231 with a SYE. Going to need a driveshaft and control arms but these spacers are going to go. I don’t need to do this for what I do but at this stage of my life it’s more what I want to do that makes me smile.
 
Mine is an LJ so a little different. RC 4 inch springs. No vibes but I hate looking at those square tube transfer case drop spacers. Driving 3 hours one way Friday to buy a low low mile 231 with a SYE. Going to need a driveshaft and control arms but these spacers are going to go. I don’t need to do this for what I do but at this stage of my life it’s more what I want to do that makes me smile.

Gotta do what makes you happy brother and fuck the rest... ✌️
 
Yeah buddy. Ordering parts now to build a CAI that’s going to stick out of the cowl with one of those spinning pre filters which makes no sense but it will be fun.