Detroit Speed - Archived Differential - 070881-308DS-R

The Detroit Speed FN988 Torque Arm Differential delivers exceptional performance and refinement for 3rd and 4th Gen Camaro and Firebird applications. By combining the quiet efficiency of the Ford 8.8 gear set with a dropout center section and integral torque arm mount, it provides the ultimate solution for vehicles running a 9”-style housing. The FN988 merges the proven strength of the Ford 9” with the smoother, more efficient operation of the 8.8, creating a modern, high-strength differential built for today’s Pro Touring and high-output street builds. Featuring a 31-spline Truetrac differential, 1350-series yoke, and five gear ratio options, it delivers unmatched driveline control, strength, and reliability - engineered, tested, and proven the Detroit Speed way. ENGINEERED FOR STRENGTH Detroit Speed’s FN988 Torque Arm assembly sets the standard for precision and performance in differential design. The integrated torque arm mount eliminates the need for additional brackets common in 9” axle housing swaps, improving the tight packaging constraints in 3rd/4th gen F-Bodies. Each case is cast from high strength nodular iron and machined to exacting tolerances. Forged steel bearing caps further increase strength in high horsepower application. Assembled with a 31 spline True-Trac Differential, Ford Racing gear sets, high quality bearings and heavy-duty 1350 yoke ensures durability under modern power levels, making it ideal for high-horsepower LS and LT builds. TRUSTED BY TOP INDUSTRY PROFESSIONALS Designed with professional builders and advanced enthusiasts in mind, the FN988 is trusted and used by many of the highest quality build shops in the country. The quiet, efficient operation offers a level of refinement consistent with the high quality builds across the country. Its precise geometry, housing alignment, and superior materials make it the perfect foundation for Pro Touring and performance builds requiring exact tolerances and modern driveline control.

Note: REM POLISHED GEARS What is REM treatment? This polishing process creates a smooth micro-textured surface on the gearset for enhance oil retention properties. Commonly used by racing professionals looking for every advantage, the result of REM treatment is reduced heat and friction, increased component life, and quiet, efficient operation. FITMENT NOTES Fits: 1982–2002 Chevrolet Camaro & Pontiac Firebird (3rd & 4th Gen F-Body) with 9” axle housings: Compatibility: Detroit Speed torque arm rear axle housing: Differential: 31-spline Truetrac: Gear Ratio: 3.08: Yoke: 1350-Series: Ideal For: Pro Touring, high-performance street, and competition builds