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4L60-E, 4L65-E, 4L75-E (300mm) Performance Converter

265mm Damperless Multi-Plate Racekit

Part No.


265mm Damperless Multi-Plate Racekit
  • 265mm Damperless Multi-Plate Racekit


4L60-E, 4L65-E, 4L75-E (300mm) Performance Converter

265mm Damperless Multi-Plate Racekit

Part No. GM-RK-405WC

  • Impeller Hub
  • Sprag Cartridge
  • Turbine Hub
  • Pilot
  • Front Cover
  • Washer Vespel®
  • O-Ring Fluorocarbon
  • Seal PTFE
  • Clutch Plate with External Splines, Woven Carbon Friction
  • Clutch Plate with Internal Splines, Woven Carbon Frictions
  • Damperless Piston
  • Thrust Bearing Turbine-side
  • Thrust Bearing Impeller-side

Street/Strip applications only.

  • Turbine Hub Input Spline Count: 30
  • Unit Size: 300mm
  • Dampered: No
  • Lock Up: Yes
  • Clutch Material: Woven Carbon
  • Core: GM 265mm

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

Sonnax GM-RK-405WC damperless multi-plate racekit for GM 4L60-E, 4L65-E, 4L75-E (300mm) applications, now available with woven carbon clutch plates, delivers the performance characteristics of a high-stall with maximum lockup capacity. Sonnax racekits 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 4L60-E, 4L65-E, 4L75-E (300mm). Other kits that utilize GM 245mm or 258mm core are available.

  • Build in a variety of stall speeds
  • Fast, easy assembly with predictable tuning adjustments
  • Fits 10.750", 11.062" and 11.500" flexplate bolt patterns
  • Chromoly 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
  • Weld-on pilot adapts to many applications

Includes Sonnax base kit GM-RK-20MWC.

  • Patent No. 6,902,046

Sonnax Performance Converter Kits

Engineered to Deliver Builds that Last

Designed from the ground up to outperform OE and other aftermarket components, Sonnax has you covered with a full line of performance converter kits for gas and diesel vehicles. Offering the widest variety of options in the aftermarket, these innovative kits deliver customized performance and value.

Small/Large Diameter Single-Plate/Multi-Plate/Non-Lockup Dampered/Damperless

Learn more about Sonnax performance converter kits!

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