[bobcowan]

In my FFR, I used a cast iron housing, factory rear cover, and aluminum front "bushings". I used a Ford R&P, and an Eaton Tru-Trak. I bought the strongest 28 spline axles I could find at the time. The 427W made over 500hp on the chassis dyno.

I beat the cr ap out of that car on the road course and the street for 12 years. I loved to pop the clutch and burn rubber. Donuts always make me laugh like 12 year old. Never had any problem with the differential. It easily held up to all that abuse.