How do you think 4" full size Jeep lift springs would work for my YJ in SUA form? I think Rusty makes a kit. That should be good for 35s and get me more wheelbase, ya? Think it would be too stiff? I think I'm either going to do that, or get stock or Rancho 2.5" FSJ springs. That way I could run them SUA for a while with my 31s.

Put a set under a buddies 5 awhile back. Stretched the wheel base nicely. Who need a kit? Just move the shackle hangers acordingly

Which springs did you use? Did it give a stiff ride? How does it flex?

Used the Rancho 2.5" lift ones. They are firm, But thats what we were after, The guy pretty much only uses it in the sand. He does run 33 X 15.50 SX's on the trail, when the 21.50 scoopers aren't on it.

Using them SUA you're not going to get much lift. 33's no problem with some wheel well triming. Beyond that???