ACC Performance Transmission Valve Body

About ACC Performance Products Plus

Since 1971, ACC Performance Products Plus has been one of the automotive industry's most dedicated manufacturers of high-performance and specialty torque converters. Based in Muscle Shoals, Alabama, the brand has spent over five decades refining the craft of converter building for everything from laid-back street cruisers to full-tilt drag race machines. Their reputation is built on a straightforward philosophy: hand-build every unit to the highest standards, and never cut corners on quality.

Under founder Nelson Gill's leadership, ACC Performance brought a background in aircraft engineering into the world of automotive drivetrain components. That aerospace mindset is evident throughout the production process — converters undergo an exhaustive multi-step quality control procedure before leaving the shop floor. The brand also adheres to Six Sigma world-class manufacturing methods and ISO 9000 quality standards, ensuring consistency that performance enthusiasts can count on.

The Boss HOG Difference

The flagship Boss HOG converter line is what put ACC Performance on the map, and it remains the cornerstone of the brand today. One of the most important distinctions of the Boss HOG series is that the fins are welded — not furnace brazed — to the converter shell. Furnace brazing, despite being common in the industry, can erode over time and damage internal rotating components. Welding eliminates that failure mode entirely. ACC also uses industrial-grade Torrington-type bearings and aircraft aluminum washers internally, helping the converter withstand thousands of pounds of torque while keeping as much horsepower as possible reaching the wheels.

The lineup spans several application-specific series. The Out Law Series is engineered for builds running nitrous, turbochargers, superchargers, or trans-brakes — anywhere high shock loads and elevated power levels demand extra durability. Other series like the Night Stalker and Street Bandit target enthusiasts who want improved performance on the street without sacrificing drivability. Coverage spans GM, Ford, and Mopar automatic transmissions, making ACC a go-to brand for classic muscle cars, street rods, rat rods, trucks, and purpose-built race cars alike.

Torque Converter Hardware

Beyond the converters themselves, ACC Performance also supplies the critical torque converter hardware needed for proper installation and long-term reliability. Mounting hardware, flexplate bolts, and related fasteners are manufactured to the same exacting standards as the converters, ensuring that every component in the drivetrain connection works as a cohesive, durable system.

Automatic Transmission Torque Converters

At the heart of the ACC catalog are their automatic transmission torque converters — the units that transfer engine power through the fluid coupling to the transmission. ACC offers a stall speed range to match nearly any combination of camshaft profile, engine displacement, and intended use, whether that's a choppy idle cam street rod or a purpose-built no-prep racer.

With over five decades of hands-on experience, a rigorous quality process, and a genuine passion for American-made performance, ACC Performance remains a trusted name for builders who take their drivetrain seriously.