I measured at the shock mounts bolt holes center to center shocks disconnected. Unknown mfg 4" lift spring 5 leaves. ORD, freshly installed, bushings and FUSH with HD shackles. All bushing hardware at the time of measurement was finger tight. U bolts were tight as I didn't disturb them. I only used the weight of the axle, and tires, to take the measurement
So a clarification, the sway bar bushing brackets were loose when I did the first measurement. The sway bar was pushing the axle @3/4" to right when I let the front eyes drop out of there brackets to swap out the bushings.
I have been also measuring top plate of u bolts to bottom edge of bump stop bracket, but I didn't get that measurement at full droop.