The factory torque converter in a 5R55 equipped Mustang GT was intended for smooth daily driving, not for handling a cammed engine, a power adder, or repeated hard launches. The Circle D 245mm Pro Series 5R55 Torque Converter replaces it with a fully custom billet converter, built specifically for 2005-2010 Mustangs and tailored to your exact combination.
Built to match your setup, not a generic replacement. Every Pro Series 5R55 converter is custom built to match a wide variety of engine combinations and power levels, from a mildly built 4.6L to a heavily modified 3V running forced induction. Circle D uses a billet front cover and billet lockup apply piston in place of the factory stamped components, giving the converter significantly more strength right where the factory unit is most likely to fail under increased power or repeated hard use.
Durability built in from the ground up. This converter is furnace brazed and hand TIG welded rather than stamped and glued like the factory piece, which holds up far better over years of hard driving. Heavy duty Torrington style bearings are used to reduce friction and extend service life, and a flanged style hub adds anti-flex durability that keeps the converter performing consistently run after run. Every converter is hand assembled to exacting tolerances, giving you a level of build quality you simply won't find in a factory or rebuilt unit.
Built with future upgrades in mind. This converter can be converted to fit a 4R70 transmission easily, giving you flexibility down the road if your build ever moves to a different transmission platform. It's a detail that shows the kind of forward thinking Circle D puts into every converter they build.
Product Benefits
- Custom built to match your combination
- Billet front cover
- Billet lockup apply piston
- Furnace brazed and hand TIG welded
- Heavy duty Torrington style bearings
- Flanged style hub
- Can be converted to 4R70 easily
- Hand assembled to exacting tolerances
- Built for 2005-2010 Mustang GT
- Custom manufactured in the USA
About Circle D Specialties: Circle D Specialties has been building torque converters since 1976, growing from a Houston auto repair shop into one of the most trusted names in performance transmission technology. Using CFD modeling, SolidWorks design, and 5-axis CNC machining done entirely in-house, Circle D custom tailors converters to match each customer's exact combination. Their converters have powered record setting drag cars, including the Silver Bullet, which set the world record for fastest naturally aspirated S550 Mustang, alongside a wide range of high horsepower street and race builds.
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Product Specifications & Vehicle Fitment
Review the product details and confirm compatibility with your vehicle before ordering.
| Specification | Details |
|---|---|
| Vehicle Fitment | 2005, 2006, 2007, 2008, 2009, 2010 |
| Vehicle Trim | V6, GT |
