ST Iron Package

(Up to 700 hp; 26.70-lb. case)

The ST Iron package is a completely assembled Ford 9” third member equipped with selected options and shipped ready to install. Cases are constructed from high-grade nodular iron and feature a radial-ribbed design, providing more uniformed support for the pinion and carrier bearings. The caps, also nodular iron, are designed with increased thickness for added strength and ring-gear stability. The ST Iron case bores measure in at 3.0625”, matching the OEM large-bearing size for use with 31-spline axles, or 3.25" for use with 35-spline axles. Standard components include Truetrac torque sensing differential, a chromemoly 1350 yoke and Daytona-style iron pinion support. Ring-and-pinion-gear selections range from 3.50-4.57:1. Gears are professionally adjusted when assembled.

8520-112 - ST Iron nodular case, 31-spline
Truetrac differential, 8620 gear set with choice of ratio (3.50-4.57),
chrome-moly 1350 yoke, Daytona iron pinion support

8820-122 - ST Iron nodular case, 35-spline
Truetrac differential, 8620 gear set with choice of ratio (3.50-4.57),
chrome-moly 1350 yoke, Daytona iron pinion support

All specifications and prices listed throughout the website and linked documents are subject to change.

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