New, nodular iron 489 casting built with forged steel caps, billet adjusters, crush sleeve eliminator and choice of ratio, yoke, clutch sure-grip or spool.
Third members are built to order. Please allow several days turnaround.
Use conventional 85 W 140, GL-5 grade gear lube. Add 1 bottle XL3 Ford Friction modifier additive when installing the clutch sure-grip differential.