The cases are made from ASTM A536 65-45-12 nodular ductile iron here in the U.S.A..
The cases have chrome moly caps.
The 3.250 (carrier bearing O.D.) case has billet adjusters. INSTOCK (For 35 and 40 spline axles)
The 2.891 (carrier bearing O.D.) case has stamped adjusters. IN STOCK (For 28 and 31 spline axles)
We are using 170,000 psi. minimum tensile strength aircraft quality main cap bolts. Standard grade 8 bolts are 150,000 psi. minimum tensile strength.
It utilizes the thrustblock anti ring gear deflection device.
With the thrustblock, extra case ribbing isn't as critical because the case doesn't flex like a non thrust block case; do to the fact that the ring gear side load is controlled at the point where it occurs instead of 3 inches away at the bearing.
Stock 9" Ford gears will NOT work with these cases.