New, nodular iron 489 casting with forged steel caps, billet adjusters, choice of ratio, choice of DoctorDiff 6-helical gear "Sure-Trac" differential or spool, crush sleeve eliminator and 7290 or 1350 forged steel U-bolt yoke.
Third members are built to order. Please allow several days turnaround.
Use conventional 85 W 140, GL-5 grade gear lube. Friction modifier additive is not necessary.