Not my Jeep....I repeat, not my Jeep. Poor set-up IMO.
IIRC this belongs/belonged to a guy named Rob. He was not happy with several things about it and was asking for advice. It's SOA on stock saggy leafs & ~1-2" lift shackles depending on which lower bolt hole of the day was being used.
Typically, shackles with that amount of lift will contribute to this:
So I'll chime in, but my shackles are a bit shorter.
SOA, stock YJ springs, extra main leaf in the rear.
1" longer-than-stock heavy-duty shackles, 5" center-to center, so 1/2" lift.
1" body lift, TJ flares, 35s.
I think it's the perfect combo. She flexes great and doesn't rub the body too bad when flexed. I suppose you could run longer shackles, but the rear driveshaft angle is pretty tight as it is, and longer shackles up front will hurt your approach angle.