ATI has teamed up with Richmond Gears to produce a limited supply of custom 4.00 Pro Ring & Pinion sets in stock for 9.5” Ford style rear ends. The 4.00 ratio has been proven to provide lower RPM through the traps and is available exclusively through ATI. These heavy-duty race Ring & Pinion sets (Part # 139400) feature a 35-spline stem made and are made from 9310 steel alloy for bulletproof reliability. A special lightweight version (Part #139400L) is available for just $100 more.

ATI Performance Products, Inc. is located in Baltimore, MD, and specializes in producing and maintaining high performance products for street and strip applications. Over the years ATI has earned a reputation for its cutting edge technology, attention to detail, and rigorous testing under race conditions.

ATI Performance Products
T: (410) 298-4343
F: (410) 298-3579

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