Phoenix includes a custom-matched and balanced torque converter as part of its transmission packages. It optioned our converter with a heavy-duty one-piece front cover, reinforced fins, a machined billet hub center, bronze support bushings, Torrington bearings, extra long input shaft splines, a hardened pump drive, anti-balloon plates, and beefier springs and sprags. Since our project Mustang will be fitted with relatively small 275/60R15 drag radials, we had Phoenix set the stall speed at 2,000-2,500 rpm. While that may seem a bit tight, our big-block Ford kicks out 673 lb-ft of torque, and we'd rather take a conservative approach while dialing in the chassis to prevent blowing off the tires. If the car hooks hard and needs more grunt out of the hole, we'll have Phoenix loosen the converter up in the future.