A performance torque converter is highly specialized based on the performance characteristics of the specific vehicle. Sonnax has several levels of kits to ensure the best combination of performance and value for each application.

Sonnax performance converter kit GM-RK-485 forGM 4L80-E, 4L85-Eapplications delivers the performance characteristics of a high-stall with maximum lockup capacity. Sonnax performance converter kits ensure fast, easy assembly with predictable tuning adjustments.

Sonnax offers the most comprehensive range — and growing number — of converter kits for anyone building aGM4L80-E, 4L85-E.Other kits that utilize GM 245mm or 258mm core are available.

• Build in a variety of stall speeds
• 快速，易于装配，具有可预测的调谐调整
• 适合10.750“，11.062”和11.500“弯曲板螺栓图案
• 铬化steel turbine and impeller hubs for strength and durability
• Fully-machined forged front cover and damperless piston add strength and durability
• Sprag cartridge delivers more than twice the holding capacity of OE
• 焊上飞行员适应many applications