Circle D Specialties

In Houston, Circle D Specialties is an automotive customization business focused on performance torque converters. It builds converters to match a customer's engine, transmission, power setup, and intended use, with specialists helping specify combinations that are not in its fitment listings. Components are CNC-machined in-house, then hand-assembled and checked for tolerances. Each converter goes through dimensional inspection, balance checks, and leak and pressure verification before shipment. The product range includes converters for GM, Ford, Mopar, and universal applications, including custom and race builds. The online catalog also offers parts, flexplates, and gear. Customers can use the converter spec form to request a custom build or the service form to arrange converter service.