So, just at the tranny cross member, you are 3/4" low? At the front and rear, your measurements are the same on both the passenger and driver side? Same, meaning equal on both passenger and driver side? Or Same, meaning 3/4" off from passenger side to driver side when measuring at the front and rear?
If the measurement is consistently 3/4" at front and middle, and or rear, on just one side, then you have the "Willys Lean". Very common.
If the low spot is at just the passenger side tranny cross member, something is bent.
Tim