Ford 10.25  
12 bolt rear cover with 10.25" ring gear. Most applications were full floating
however some applications do have c/clip axles. Differentials older than 1993
will require a new yoke to be compatible with a new ring and pinion.

Ford 10.5  
12 bolt rear cover with 10.5" ring gear. Has full floating axles.

Ford 7.5  
10 bolt rear cover with 7.5" ring gear. Has c/clip axles with 28 splines.

Ford 8.0  
Drop out style rear end with 8" ring gear. Has removable pinion support on the front.
Uses 28 spline axles.
Has 4 horizontal ribs.

Ford 8.8  
10 bolt rear cover with 8.8" ring gear. Rear applications have c/clip axles
in both 28 and 31 spline. Front applications are in late model IFS Ford's and
will have 28 spline axles using CV joints.

Ford 9.0  
Drop out style rear with 9" ring gear. Available in both 28 and 31 spline.
Has removable pinion support.
Has 5 horizontal ribs.

Ford 9.75  
12 bolt rear cover with 9.75" ring gear. Has 34 spline c/clip axles.