Our completely NEW 9" Ford third members start with a heavy duty cast iron carrier featuring the larger, cast iron Daytona pinion support. Then we use a Currie 9+ limited slip differential in your choice of 28 or 31 spline and a 3.50, 3.70, 3.89, 4.11, or 4.56 gear ratio ring & pinion. Also includes NEW bearings and seals. Shipped ready for use in a plastic case.
Currie Differential Tech Bulletin (PDF)