Cusco LSD 431 K15 Type MZ Limited Slip Differential 1.5-Way Rear Mazda MX-5 Miata ND

The Cusco LSD 431 K15 is a Type MZ limited slip differential engineered specifically for the 2016-2022 Mazda MX-5 Miata (ND chassis) rear axle. This high-performance LSD is configured as a 1.5-way unit with the flexibility to convert to 2-way operation, making it ideal for track-focused applications where maximum performance and durability are critical.

Type MZ Technology:

The Type MZ design features cone spring activation where the pressure opposes the direction of initial torque, creating the highest initial torque rating of any Cusco LSD model. This high-pressure cone spring engages the full clutch pack at a linear rate, delivering smooth yet aggressive power transfer ideal for high-horsepower builds and competitive motorsports use. The Type MZ utilizes an upgraded clutch pack with ten plates per side (versus eight on earlier designs), significantly increasing lock-up performance and durability under extreme conditions.

Key Features:

• Type MZ 1.5-way configuration (convertible to 2-way)
• Designed for 2016-2022 Mazda MX-5 Miata ND rear differential
• Ten-plate clutch pack per side for maximum holding power
• High initial torque rating for track and competition use
• Cone spring activation for linear, progressive engagement
• Radially-cut clutch plate grooves for optimal oil flow
• Polished pressure ring contact surfaces for even clutch plate wear
• Cusco Oil Through System for enhanced lubrication and cooling
• Dual-profile pressure rings allow configuration changes without additional parts
• High-tension chrome molybdenum steel housing and gears
• ISO 9001 certified manufacturing quality

1.5-Way vs 2-Way Operation:

The 1.5-way setting activates strongly under acceleration while providing reduced locking under deceleration compared to a full 2-way setup, helping minimize understeer during corner entry. The 2-way configuration provides full locking force on both acceleration and deceleration, recommended for aggressive driving styles and drift applications. The pressure ring design allows switching between configurations during servicing without purchasing additional components.

The Type MZ is purpose-built for high-power vehicles and race applications where the Type RS may not provide sufficient locking force. With nearly 50 years of Cusco motorsport engineering backing this differential, it delivers professional-grade performance and reliability for serious enthusiasts and competitors.