Jeffy you know your vehicles. But the last time you had a relatively stock Jeep YJ was in what, 1993?
Look, you lift your wheels on the rocks, with no locker(s), in a
stock YJ -- and you will because, stock, the YJ suspension is about as loose as Mother Theresa in a straight jacket -- you are dead in the water on a climb. It doesn't matter what aired out 31s-37s MT you're YJ is wearing. If both of them, probably in the rear, aren't on the ground, then you're over.
I have seen guys -- 1 that
used to use the 4bangerjp site and 1 that still does -- driving TJs, no lockers, with 31" and 33" inch tires make the climb because they simply had the traction enabled by their TJs' suspension flex. Their TJs were able to keep both tires on the ground on a rock climb -- the climb weighing down their TJ's rears -- and they were able to proceed forward.
If I did this on my stiff, stock YJ, even with 31s or 33 MTs aired out, I'd be stranded if it weren't for driver-induced momentum and a locker in one axle that was managing to pull me up on the one front wheel that was getting traction ).
If you want to smite me, I understand.