To my knowledge, only the XR6s ever had 3.45 diffs standard. However, I understand LSDs of taller ratios were fitted to the E-series Ghias with the exception of the EF series I.
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S