Re: The Great Diff Debacle...
Generally speaking, 3 speed EAs and late X series cars had the 2.77, manuals had the 2.92, EA 4 speeds had the 3.08 (or 3.23), and only Ghias and LTDs had LSD - all were 25 spline.
EB II had 3.27 and 28 spline but ED went back to 3.08, where I believe the base six has remained ever since (unfortunately). All XR6s have 3.45 LSD, and V8s are 3.23 I believe.
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S