ACC Performance Automatic Transmission Torque Converter

ACC Performance Boss Hog Torque Converters: Built for the Serious Enthusiast

When it comes to automatic transmission torque converters, few names carry the pedigree that ACC Performance has built over more than five decades. Founded in 1970 and headquartered in Muscle Shoals, Alabama, ACC Performance has spent generations refining a single craft — building high-performance torque converters that deliver measurable results on the street, the strip, and everywhere in between.

At the heart of the ACC Performance lineup is the iconic Boss Hog series, a family of converters engineered around several key construction philosophies that set them apart from mass-produced alternatives. The most significant is how the fins are joined: all Boss Hog torque converters are welded at the fins, not furnace brazed. As ACC explains, brazing erodes over time — much like the coating on a non-stick pan — eventually degrading the stator and other rotating components inside the transmission. Welded fins eliminate that failure point entirely.

ACC Performance's commitment to aircraft-grade engineering shows throughout the converter. Each unit employs industrial-grade Torrington bearings capable of handling not hundreds but thousands of pounds of torque, and replaces the traditional fiber thrust washers with aircraft-quality aluminum washers that improve power transfer directly to the drivetrain. These aren't cosmetic upgrades — they translate to measurable horsepower gains at the wheels.

The Boss Hog Product Lines

ACC Performance offers a tiered lineup of Boss Hog converters to match the application, whether you're building a reliable daily driver or a dedicated weekend racer:

• Night Stalker — The entry-level performance converter, available in stall ranges from roughly 1,600 to 2,800 RPM, ideal for stock to mildly modified street engines. Compatible with popular GM transmissions like the TH-350, TH-400, 700R4, and 4L60E.
• Street Bandit — A step up in stall speed (2,800–4,200 RPM range), designed for more aggressive street/strip builds where cam timing and power adders demand a higher flash stall.
• Outlaw — Aimed at performance-oriented builds in the 2,800–3,200 RPM stall range, available for the TH-350 and TH-400, bridging the gap between spirited street driving and competition use.

Coverage spans GM, Ford, and Mopar applications, making ACC Performance a versatile choice regardless of what's under your hood. Every converter is hand-built and passes through a rigorous multi-step quality control process — the company takes 92 quality control steps with its converter line — before it ever reaches the customer.

Why ACC Performance Stands Out in This Category

ACC Performance is a veteran-owned, engineering-driven company that applies aerospace manufacturing discipline to the performance automotive world. Production follows Six Sigma World Class Manufacturing principles and aligns with ISO 9000 quality standards — a level of process control rarely found in the specialty torque converter segment. The result is a converter that is precisely matched to stall speed using proven proprietary methods, ensuring your engine combination and drivetrain work in harmony rather than fighting each other.

For builders who want a purpose-built torque converter with real manufacturing integrity behind it — not a rebuilt OEM unit — ACC Performance's Boss Hog lineup represents a compelling choice at a competitive price point.