Eaton Torque Control Products Posi Limited-Slip Differential

The Eaton Posi Limited-Slip Differential — also known as a Positraction or Posi-trac differential — is a race-proven, clutch-type limited-slip unit engineered to prevent wheel slip before it occurs. Backed by over 60 years of product engineering, testing, and real-world validation, the Eaton Posi has earned its reputation as an industry benchmark in high-performance limited-slip technology, trusted by OEM manufacturers and performance enthusiasts alike.

How It Works:

The Eaton Posi uses two complementary performance mechanisms to deliver automatic, torque-sensing traction control. At low torque levels, preload springs energize the carbon disc clutch packs seated behind each differential side gear, applying an initial bias resistance. As torque increases, the gear tooth geometry forces the side gears away from the pinion gears, generating progressively higher clamping force on the clutch packs — automatically slowing the low-traction wheel and routing power to the wheel with the most grip. This fully automatic design requires zero driver input and delivers consistent, predictable traction across a wide range of driving conditions.

Key Features:

• Race-bred carbon disc clutch packs provide reliable, consistent power transfer under sustained high-torque demands
• Proprietary Eaton friction disc material engineered for maximum grip, long-term durability, and chatter-free operation
• Precision-forged internal gears deliver industry-leading strength and extended service life
• Preloaded central spring assembly maintains optimal clutch engagement and balanced load distribution between both sides
• Adjustable spring cage design allows different spring loads to be swapped in, enabling tuning of the initial bias ratio and torque transfer characteristics
• Fully automatic, torque-sensing operation — no driver intervention required
• Rebuildable steel construction engineered for long-term serviceability and repeat use
• Smooth, quiet street manners — no chatter or harshness associated with lower-quality limited-slip designs
• Validated at Eaton's Michigan-based proving grounds, including 700-acre test facilities and dedicated dynamometer testing
• Well-suited for street performance builds, classic muscle cars, hot rods, drag racing, and light off-road applications

Every Eaton Posi unit is subjected to rigorous factory validation for strength, durability, performance, and torque capacity prior to shipment. Available across a wide range of axle applications and gear ratios, the Eaton Posi delivers professional-grade traction enhancement whether you're building a classic muscle car, a high-output street machine, or a reliable daily driver.