ACT 99-02 Nissan Skyline GT-R (R34) Mod-Twin 225 HD Sprung Street

T1SS-N04 Mod-Twin 225 HD Sprung Street Kit is designed for high powered AWD street cars. It unites uncompromised pedal feel, durability, engagement quality with very high torque capacity by combining twice the organic friction surfaces with an ultra-durable spring center Mono-Drive hub in a completely modular design. Each diaphragm spring endures an exclusive four-stage heat treating process providing a consistent light pedal feel. Steel-backed Friction Plates with high quality organic friction materials deliver stable friction coefficient, good heat capacity and long clutch life. These Friction Plates uniformly transfer torque to the Mono-Drive sprung hub assembly which extends input shaft life and reduces driveline shock from torsional vibration. This kit includes a CNC-machined and dynamically balanced flywheel, pressure plate cover, diaphragm spring, face, puck-style ceramic friction plates, sprung Mono-Drive hub assembly, floater, patented Monoloc Collar, release bearing, alignment tool and pilot bearing (if needed). Mod-Twin clutches are fully rebuildable and most components can be ordered separately. Mod-Twin 225 HD Sprung Street Soft progressive engagement, light pedal effort, smooth shifting with OE to mild transmission gear noise; Forged Aluminum Cover, Mono-drive hub, exclusive diaphragm, premium friction materials, and hardened wear points ensure this long-life twin performs and survives under the most demanding conditions; Delivers maximum performance and high heat tolerance by combining robust design, strategic features, choice materials, and close tolerances; Street or Street/Strip; Applying tactical engineering to the MOD-TWIN, ACT presents unique solutions to common tradeoffs found on twin disc clutches, resulting in an ultra-durable, customer serviceable, long-lasting clutch with very high torque capacity. All are 100% clamp load tested, balanced and SFI certified

• "Excellence in Performance", backed by the best one-year warranty in the industry!

The ACT T1SS-N04 Mod-Twin 225 HD Sprung Street clutch kit is engineered for high-powered, all-wheel-drive street cars, including the 1999-2002 Nissan Skyline GT-R (R34). This twin-disc system combines high torque capacity, durable construction, smooth engagement, and a consistent pedal feel for demanding street and street/strip applications. Its modular design uses twice the organic friction surface area to support reliable power transfer while maintaining smooth shifting and manageable OE-to-mild transmission gear noise.
The kit features a forged aluminum cover, an exclusive diaphragm spring, steel-backed friction plates, premium organic friction materials, and a sprung Mono-Drive hub assembly. Each diaphragm spring undergoes a four-stage heat-treating process to help provide consistent, light pedal effort. The friction plates offer a stable coefficient of friction, useful heat capacity, and long service life, while the sprung Mono-Drive hub helps reduce driveline shock from torsional vibration and extend input shaft life. Hardened wear points and close manufacturing tolerances support dependable performance under severe operating conditions.
The ACT T1SS-N04 package includes a CNC-machined and dynamically balanced flywheel, pressure plate cover, diaphragm spring, face, puck-style ceramic friction plates, sprung Mono-Drive hub assembly, floater, patented Monoloc Collar, release bearing, alignment tool, and pilot bearing when required. Mod-Twin components are fully rebuildable, and many individual components can be ordered separately for long-term serviceability. Every clutch is clamp-load tested, balanced, and SFI certified. ACT backs the kit with a one-year limited warranty, providing added confidence for performance-focused street applications.

Features:

• Designed for high-powered AWD street cars and street/strip applications

• Twin-disc Mod-Twin design provides high torque capacity and increased friction surface area

• Sprung Mono-Drive hub helps reduce driveline shock and torsional vibration

• Four-stage heat-treated diaphragm spring supports consistent, light pedal effort

• Premium organic friction materials provide smooth engagement, stable friction, and long clutch life

• Forged aluminum cover and hardened wear points deliver durable performance

• CNC-machined, dynamically balanced flywheel is included

• Complete kit includes pressure plate, friction discs, floater, Monoloc Collar, release bearing, alignment tool, and pilot bearing when required

• Fully rebuildable modular design with separately serviceable components

• 100% clamp-load tested, balanced, and SFI certified

• Backed by ACT's one-year limited warranty