Cusco LSD6C1VT15 Type-RS Rear Spec-F 1.5-Way Limited Slip Differential

The Cusco LSD6C1VT15 is a Type-RS Spec-F Rear Limited Slip Differential engineered for the 2022+ Toyota GR86 (ZN8) and Subaru BRZ (ZD8). Configured as a 1.5-way LSD, it delivers performance-tuned traction with a refined, reduced-friction design that makes it equally suited to spirited street driving and track use.

Type-RS Coil Spring Design:

• Coil spring preload replaces the conventional single cone spring, providing more consistent clutch engagement throughout the life of the differential
• Coil springs maintain stable preload over time, unlike cone springs that can weaken with use and lead to unpredictable behavior
• Multiple coil springs allow tunable preload — adjust engagement characteristics by adding or removing springs
• Lower initial torque than the Type-MZ results in smoother, quicker clutch response and reduced power loss
• Reduced clutch plate pressure improves durability, lowers chatter, and extends LSD fluid change intervals

Spec-F Reduced Friction Technology:

• Precision-polished flat friction disc surfaces generate uniform, smooth frictional force
• Lower friction coefficient versus standard clutch disc design for improved power transfer efficiency
• Smoother and more stable engagement character, ideal for street and mixed-use applications

1.5-Way Configuration:

• Activates fully under acceleration for maximum traction out of corners
• Partial deceleration locking reduces understeer under trail braking — ideal for drivers who want rotation without overly aggressive snap
• Default ramp angles: 35° acceleration / 20° deceleration
• Optional ramp angles: 45° acceleration / 20° deceleration for more aggressive acceleration lockup

The Cusco Type-RS Spec-F LSD is a direct-fit, drop-in replacement for the factory open differential, offering a meaningful performance upgrade without sacrificing daily drivability.