Ford 9" 35 spline steel spool 7/16" bolts

Mark Williams steel spools are made from 4140 steel and are precision machined for accuracy and reliability. They are designed to prevent ring gear deflection and are through-hardened for strength.

• The description claims the spools are made from through-hardened alloy steel for ultimate strength.
• The description claims the ring gear mounting diameter is ground to a precise press fit.
• The description claims all mounting diameters are concentric and square within .001 inch.