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-488WC for GM 4L80-E, 4L85-E applications, now available with woven carbon clutch plates, 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 a GM-4L80-E, 4L85-E. Other kits that utilize GM 245mm or 265mm 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
• Fits 10.750", 11.062" and 11.500" flexplate bolt patterns
• Chromoly steel turbine and impeller hubs for strength and durability
• 完全加工的锻造前盖和无损伤的活塞增加了强度和耐用性
• Sprag cartridge delivers more than twice the holding capacity of OE
• Weld-on pilot adapts to many applications