Do 3.5-4" lifts require a SYE?

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... ✌️